The technology and its application
Underwater tools for observing fish have a long history as aids to fishers across sectors. Single and dual frequency sonar technology are common tools for detecting fish (Horne 2000), but cameras that capture still images and video are increasingly used to gather details about fish size, species, and location that are more challenging to glean using tools that locate fish indirectly. Cameras have become a useful tool for ecological research, with increasing use of camera traps, baited remote underwater video (BRUV), swim-by cameras, and videography biologging devices, across a range of applications, from behavioral observations, to estimates of distribution and abundance (Hamel et al. 2013; Struthers et al. 2015; Widmer et al. 2019). Just as scientists benefit from using these remote imaging devices to find and monitor fish, recreational anglers are increasingly using underwater cameras as tools for enhancing the fishing experience.
Cameras used for fishing include those that are directly developed and marketed as tools to enhance fishing productivity as well as the adaptation of general-purpose underwater cameras for observing fish. The popularity of such devices has grown with the increasing availability and reliability of the technology, particularly with respect to adequate miniaturization, image quality, data streaming/storage capacity, and price. Cameras allow anglers to monitor the effectiveness of various fishing techniques, informing potential refinements (depth, bait/lure, retrieval, etc.) to increase catch rates. Ice angling cameras are advertised to anglers seeking better catches by watching their quarry and moving their rig to the correct depth or in an enticing way; these cameras provide an image of the water below, live streamed to a screen above water (e.g., https://www.fisherpants.com/best-ice-fishing-camera/). Line cameras such as the Water Wolf (e.g., https://www.waterwolfhd.com) do not provide such a live feed, but can be attached to the fishing line and set up just in front of the lure so that the angler can later download the footage and inspect tendencies of the fish (Gutowsky et al. 2017). Action cameras such as GoPro Hero cameras can be set up underwater to watch for fish (Struthers et al. 2015), and there are examples of anglers attaching these devices directly to fish to watch their behaviour after release (https://www.youtube.com/watch?v=fUifh5pbZ7Y) or to watch fish moving into prebaited fishing patches, as is common among specialized common carp (Cyprinus carpio) anglers. Electronic devices such as drones that record and live stream film to anglers are also increasingly important angling tools that are covered in the next section.
Implications for recreational fisheries governance
Underwater cameras are likely to appeal to the desire of anglers to both catch more fish and better understand their target species. Fish videos can be enjoyable for anglers and, when used effectively, may help to increase angler-fish interactions leading to issues for fisheries managers and the policies that they need to uphold. Fish finding devices are accepted tools, but underwater cameras present a potentially disruptive technology to the fishing landscape because of their high resolution (Struthers et al. 2015). Interestingly, while cameras are often allowed, snorkeling and fishing is often prohibited. These cameras can be used to support conservation/ethics, such as when live streamed footage allows an angler to make a rapid hookset for a fish under direct observation, potentially reducing deep hooking that can occur when a fish or other vertebrate swallows the bait (Twardek et al. 2018; Lennox et al. 2017). However, video technology can be harmful to fisheries management by increasing catch efficiency and allowing anglers to selectively target fish that they want; this reduces some of the randomness in catching fish (Seekell 2011), enhancing selection towards certain species and size classes if used too effectively unless done knowingly as part of a fisheries management plan.
Fish must encounter the gear to be caught (Lennox et al. 2017). Cameras provide an advantage to anglers by informing them about the position and behavior of fish. Presently available videography tools can add some value to anglers, but are not a panacea for mapping a waterway and finding fish. It is therefore unlikely that cameras will become a crucial component of most tackle boxes, or a tool that greatly enhances fishing success. In some applications, cameras help anglers to learn about fish and it may increase angler effectiveness, but controlled research is needed to determine the extent that cameras are being adopted and if cameras improve fish capture enough to warrant changes to management or policy. Camera technology can be relatively expensive, and therefore its application will likely be limited to specialized and affluent anglers; however, even some cellular phones with cameras are now waterproof, increasing the potential accessibility and utility of this technology. Underwater photos and videos are an attractive alternative to typical catch-and-release photos, which can impact fish through increased air exposure (Danylchuk et al. 2018; see the Smartphone section). The effects of sharing catch photos through social media is discussed in the Social Media and Smartphone sections. Research into how cameras affect angler experiences will help managers to determine how important they are to the overall enjoyment of angling, because many anglers may simply enjoy the ability to see fish even if they are not catching more of them. If any policies are needed to address the use of cameras in fisheries, they may need to focus on animal welfare implications of strapping cameras directly to fish (Cooke et al. 2016). Although knowledge is limited on the scale of adoption of present underwater camera technologies by anglers, we feel there is limited risk that cameras will substantially interfere with the health of most fisheries through increasing catches.
ROVs (aerial and aquatic)
The technology and its application
Remotely operated vehicles (ROVs) have been used for decades in aquatic systems (Yoerger et al. 2007), including for basic exploration, oceanography, archeology, and industrial applications, (e.g., as inspecting oil rigs at sea, Chen et al. 2014; Macreadie et al. 2018). Compared to manned vehicles or use of snorkeling or SCUBA, ROVs can provide access to deep and distant environments without exorbitant equipment costs, complicated logistics of deployment, complex training requirements, and inherent risks to personnel (Perritt and Sprague 2017; Macreadie et al. 2018). These traits, along with the added benefit of real-time image acquisition (versus the use of often dated bathymetric maps and satellite images), make ROVs a practical tool for making observations in and of aquatic systems. Further, in the past 10 years, advancements in the development of small, inexpensive ROVs, especially unmanned aerial vehicles (UAVs), often referred to as drones, has rapidly increased their accessibility and use for science, research, and conservation (reviewed in Floreano and Wood 2015; Macreadie et al. 2018). For under $1,500 USD, a small UAV or underwater ROV can be purchased, and have the user flying or navigating the device, as well as capturing real-time digital images and video, within hours of opening the box. This has also rapidly increased the accessibility and use of ROVs within the public domain (Markowitz et al. 2017), prompting personal exploration, creative photography, and recreation notwithstanding the challenges with line of sight and battery life.
The ‘domesticating’ of drones (Perritt and Sprague 2017) has not gone unnoticed or unappreciated by recreational anglers. The added perspective that can be provided by a small UAV or underwater ROV can shed light on factors such as intricacies in habitat structures and subtle changes in depth, as well as the locations and behaviors of fish. Such real-time reconnaissance and the ability to record and later review high definition digital still images and video can greatly reduce the guesswork that goes into finding fish, and ultimately increase the successful capture of fish by recreational anglers (see also the Underwater Camera section). It has also become a way for recreational anglers to share creative imagery of their fishing adventures on social media.
Recreational anglers have also begun using UAVs to physically assist in the capture of fish. Termed ‘drone fishing’, a UAV is used to get the terminal tackle to the fish, often well beyond a normal casting distance (Zacharie and Kyuhei 2017). The popularity of this technique started along marine coastlines to access fish beyond surf breaks (https://www.youtube.com/watch?v=8sdUZqOoAq4). For this application, the fishing line from a rod and reel is attached to the UAV, the line free-spooled, and the UAV used to place the terminal tackle near the fish that is seen in real-time on a screen associated with the remote control. Overall, this technique is receiving considerable attention on the internet (e.g., https://www.sportfishingmag.com/fishing-with-drones/) and in social media, including reviews of the best drones and features needed to maximize the potential for using UAVs for fishing, such as long battery life and flight stability (e.g., https://www.droneriot.com/best-drones-for-fishing/). The popularity of drone fishing is likely to increase as UAVs advance (e.g., models that can take off and land from water, or can be operated underwater with remotely operated appendages and no tether). Drones (e.g., remote control boats) are also being used to deliver supplemental feed in some areas, thus “baiting in” fish that can then be captured.
Although technological advancements will aid in its proliferation, drone fishing is not without its controversies within the recreational angling community. Despite being able to provide social good, such as helping disabled people fish (Barillas and Fernandez 2019) and engaging youth with underwater environments (Harmon and Gleason 2009), the broader debate includes questions about whether drone fishing provides an unfair advantage to anglers (which would presumably benefit wealthy anglers able to afford such technology), as well as access to fish that normally would be left alone and undisturbed. Independent from the federal and state laws and regulations governing the use of UAVs (covered in the following section), drone fishing is not considered an unethical practice by the International Game Fish Association (IGFA), an international non-governmental organization that promotes responsible, ethical fishing practices. Still, there remains ample discourse within the recreational angling community (e.g. via on-line angler forums) as to whether drone fishing is diluting the pure nature of the activity, or whether the use and impressions of this technology are following the same trajectory as when GPS units became more affordable and accurate to lead anglers to, and back to, productive fishing locations.
Implications for recreational fisheries governance
The use of ROVs, and particularly the use of UAVs may be restricted due to commercial air space and civil rights laws and regulations (i.e., unwanted or justified surveillance; Tobin 2015; Toonen and Bush 2018). The use of UAVs in many countries is regulated through federal and state laws, with the details varying considerably among jurisdictions. The United States Congress passed a law in 2012 allowing the use of UAVs for hobby or recreational use, similar to what would be expected for the operation of model aircrafts. However, as the popularity and use of UAVs rapidly increased, separate regulations were eventually brought forth by the Federal Aviation Administration (FAA) to reduce grey areas related to the size of drones, the registration of aircraft and display of registration numbers, flying near controlled airspaces and no-fly zones (e.g., near airports, stadiums), required training, and use for commercial purposes (e.g., real estate). This last point is particularly relevant when it comes to recreational angling, especially when a UAV is used by a fishing guide that can potentially benefit financially by putting their clients on fish, making the UAV use commercial and thus requiring additional training, certification, and scrutiny. Many countries also prohibit the use of UAVs in national parks and other public areas, which puts additional restrictions on the use of UAVs for fishing. There are also nuances related to the pilot’s citizenship, with some countries (e.g., India) completely banning the use of drones by foreigners. Even in situations where the general laws and regulations at the federal level are relatively lax, states and even communities can implement more specific and restrictive laws over the use of UAVs, all of which need to be taken into consideration as drone fishing gains in popularity. Specific to fishing, both Oregon and Texas have made it unlawful to use drones, including advanced scouting (http://www.eregulations.com/oregon/19orfw/general-restrictions/, https://tpwd.texas.gov/warden/law-enforcement-faq/drones-uavs). The regulation is broader in California, making it unlawful to use computer-assisted remote fishing, which would, in principle, prohibit the use of any technology to fish (http://www.eregulations.com/california/fishing/freshwater/fishing-methods-gear-restrictions/). Although we were unable to identify the basis for developing these regulations, they were enacted under fish and wildlife regulations and thus presumably relate specifically to the protection of natural resources.
Where and when drone fishing is permitted, it will be important to determine how this fishing method influences overall catch rates of target and non-target species (i.e., bycatch), as well as the susceptibility of angling-related injuries, especially for fish intended to be released (whether via regulations or voluntary catch-and-release ethic). Given that drone fishing extends the reach of shore-based anglers, there is the potential to target larger fish generally associated with deeper depths or within previously unexploited refuges. This may not only result in the larger fish in a population becoming more vulnerable to target and harvest, but also lead to changes in various aspects of the capture event such that fight times become longer and fish become more susceptible to barotrauma, potentially impacting the physiological stress, injury, and mortality if fish are released (Brownscombe et al. 2017). Depending on the angle of approach to a bait and the extent of the strike, drone fishing could also result in a greater incidence of deep hooking. The same could be said for underwater ROVs, whether making cryptic species more accessible or presenting baits in such a way that increases physical and/or physiological stress. Overall, this relatively new fishing method has not received the same level of scrutiny and evaluation when it comes to its influence on individual fish, fish populations, and the necessary guidelines and regulations that make recreational fisheries sustainable.
The technology and its application
Modern anglers have access to a suite of technologies that enable them to efficiently navigate amongst and within fishing sites while informed by real time data on the structure of the waterbody, current conditions, water temperature, and location of the fish (Fig. 2). Chartplotters with integrated underwater sonar provide GPS positioning on detailed system maps along with advanced underwater mapping, environmental measurement, and fish-finding capabilities digitized on sometimes large and numerous screens (https://www.onthewater.com/2019-electronics-guide). GPS also delivers real time updated information such as lunar phase, atmospheric pressure, and tides, which anglers can use to inform their fishing tactics. Boat-mounted transducers utilize sonar to generate real time images of fish and structure in up to three dimensions around the boat at ranges exceeding 100 m (https://www.saltwatersportsman.com/3D-sonar-for-fishing/). Advances in sonar technology now enable such fine scale details that some fish can be identified to species (https://www.sportfishingmag.com/identify-fish-on-sonar/). More advanced users can interpret raw sonar images, but algorithms also provide automatic fish identification and alerts. These details can be used to automatically generate 3-dimensional maps of the waterbody and marked fish locations for later reference (https://insightgenesis.wordpress.com/2014/02/14/creating-quality-insight-genesis-maps-from-logged-sonar/). Radar technology can also be used to inform the location of nearby boats (for safety and information on fishing sites), or even birds, which may inform the locations of fish (https://www.marlinmag.com/how-to-use-radar-for-fishing/). Electric motors at fishing sites enable stealthy and agile maneuvering driven manually using a remote or GPS-guided electric motors that can autonomously maintain position (e.g., over a reef or wreck), or traverse a pre-programed path (e.g., along a weedline), freeing the angler to focus solely on fishing (https://www.fishing.net.nz/fishing-advice/how-to/5-ways-to-fish-with-an-electric-trolling-motor/). We predict that these technologies will also develop rapidly in the near future, particularly in the realms of data processing, utilizing big data sets and artificial intelligence. Massive datasets gathered through connected angler applications are likely to supply machine learning algorithms with the data required to make increasingly advanced recommendations about fishing locations and tactics (which is already happening—see Smartphones section). Sonar data processing will also continue to advance, supplying anglers with increasing information about their environment, while image processing with machine learning models provide advanced information on fish locations, perhaps even specific to species, in real time. Although we focused largely on boat-based electronics, such tools can also be used when ice fishing. Feiner et al. (2020) reported that the majority of ice anglers in Minnesota used sonar units (i.e., flashers) while fishing for panfish and that it appeared to benefit the anglers’ harvest. Similar benefits were less apparent for gamefish given that more passive fishing techniques tended to be used (Feiner et al. 2020).
Implications for recreational fisheries governance
Advances in boat-based electronics are increasing the capacity of recreational anglers to locate, navigate to, and capture fish, which increases the potential for overexploitation of fish populations. For example, some anglers are now targeting individual fish located in pelagic areas with the aid of technology, such that highly selective targeting of individual trophy fish is possible. Therefore, if the fish are released, the likelihood of the individual fish being recaptured multiple times through targeted fishing increases, although no study exists to support this idea. Moreover, through echo-sounding, cryptic aggregations of fish may be effectively found, increasing the likelihood of hyperstable catch rates (Dassow et al. 2020) and generally elevated hooking mortality. However, not all anglers utilize advanced boat-based technologies due to a lack of specialization or financial commitment. Fisheries managers would therefore benefit from knowledge of the frequency at which various technologies and techniques are being used in a given fishery to make accurate assessments of potential exploitation rates, including better assessment of relationships between angler numbers, effort, and exploitation rates. Assessments of the efficacy with which anglers can target fish using advanced technologies could be integrated into precautionary approaches to fisheries management through spatial, seasonal, and harvest restrictions. Fisheries managers also often regulate the types of gear allowed in fisheries, commonly restricting the number and types of hooks and rods anglers can utilize, the use of motorized engines, or live bait (Meronek et al. 1995; Sauls and Ayala 2012). Anglers may also implement such measures voluntarily to improve their fisheries (Cooke et al. 2013). Overall, there is potential to extend regulations to include devices such as chartplotters; however, enforcement would likely be complex.
The technology and its application
Anglers have used hooks to capture fish for centuries. Early hooks were fashioned from bone or shell, and the use of hooks helped humans access protein and reside in areas that were otherwise resource poor (Thomas et al. 2007; Méry et al. 2008; O’Connor et al. 2011; Fujita et al. 2016). Since their humble beginnings thousands of years ago, innovation with fish hooks has been remarkable (see Fig. 1 in Thomas et al. 2007), and has largely occurred in three areas: shape, piercing/cutting ability, and materials. Collectively, the goal of these modifications has been to maximize capture rates and minimize fish loss, thereby imparting maximum benefits for anglers.
The proliferation of fish hook shapes and designs is vast and impressive. Anglers now have a dizzying array of styles, shapes, and sizes from which to choose. For example, the current Gamakatsu catalog is over 80 pages long (https://www.gamakatsu.com/wp-content/uploads/2019/03/2019-Gamakatsu-Catalog.pdf), the VMC catalog is over 100 pages (http://www.nos-catalogues.net/vmc-fishing-hooks/pdf/emea/2020/?page=1), and the Mustad catalog is almost 200 pages long. Hooks have also evolved in parallel with different fishing techniques in an effort to facilitate specialized fishing approaches and better integrate the hook with the lure/bait. Recent developments in the area of hooks have included the combination of hooks with weights to provide anglers a sleeker tackle profile that better mimics live prey, while allowing anglers to sink the tackle to desired depths or limit snagging. Coupled with advances to the overall shape of the hook, have been changes to the location of the hook eye, the orientation of the hook eye (e.g., turned-down or turned-up, varying degree of bends as in https://www.gamakatsu.com/product-category/freshwater/jig-hooks-60o/), as well an integration of hooks with swivels or rings to facilitate line attachment and specialized techniques such as drop-shotting. There has also been a proliferation of barb types that include the development of hooks with multiple barbs and outside barbs, all intended to minimize the loss of hooked fish. Several companies also now offer hooks with micro barbs (https://www.gamakatsu.com/product/g-carp-hump-back/) intended to quickly hook wary fish. On the other hand, hook manufacturers have also developed barbless hooks and many jurisdictions have made these mandatory to reduce capture stress (Schill and Scarpella 1997; Alós et al. 2008). Together, these advances in hook shape and style are intended to facilitate anglers fishing a range of techniques and styles that should appeal to wary fish, or access fish in difficult locations, ideally maximizing capture rate.
A second area of advancement in hook technology relates to developments in sharpness and piercing ability. Hooks uses to be sharpened mechanically, by grinding, filing or wearing away the point, similar to how one would sharpen a knife. Recently, technology has advanced to allow chemical (acid) sharpening, whereby a chemical dissolves part of the hook for a short period of time, thereby allowing a finer, smoother, and sharper hook. Mustad has developed a triangle hook with three flat surfaces that are intended to minimize loss (https://mustad-fishing.com/product/triangle-hook-4x-hoo?color=Tennese%20Shad), while Trokar has a similar concept that utilizes a triangle-shaped hook that is intended to “penetrate faster and easier” (https://www.eagleclaw.com/about-us/our-brands/trokar). In addition to specialized cutting/piercing points, Gamakatsu has developed a Nano Smooth coating that is intended to facilitate piercing (coating for fast penetration).
A final area of technological advancement in hooks relates to the materials that are used in manufacturing. Modern hooks are made by bending (forming) steel wire until it achieves the desired size and shape (https://www.youtube.com/watch?v=NiAkT1bh-9k). Recently, manufacturers have incorporated a number of processes into hook production, such as heat treating (forging) and the use of high-carbon steel that are intended to increase strength, reduce brittleness, and prevent bending/breaking under the stress of a fish (Thomas et al. 2007). Hooks made from stainless steel or vanadium designed for marine angling are intended to minimize corrosion, extending the life of a hook and preventing breakage after extended saltwater exposure (https://vmcpeche.com/vmc-coatings). Manufacturers have also worked to develop non-reflective, low-visibility hooks (https://mustad-fishing.com/product/triangle-hook-4x-hoo?color=Tennese%20Shad) to minimize the likelihood of detection.
Hooks are designed to injure fish by piercing their flesh. As such, a great deal of effort has been invested in minimizing the possibility of injuries for angled fish and facilitate intentional release, thereby resulting in improved conservation benefits. Circle hooks are a prime example of development in hook technology with conservation benefits, because circle hooks have been shown to hook fish in injurious locations less often than conventional J-style hooks, thereby improving outcomes for released fish and reducing mortality (Cooke and Suski 2004). Owing to this conservation value, virtually all hook manufacturers now offer a wide array of circle hook options to anglers. Many companies are also actively promoting the conservation benefits. Mustad, for example, highlights circle hooks as a way to “Avoid deeply hooked fish and give it a real chance at swimming back out into the water” (https://mustad-fishing.com/products/circle-hooks). In addition to circle hooks, Gamakatsu currently offers a line of ‘Magic Eye’ hooks that are “far kinder to our finned friends” because they facilitate release of hooked fish (https://www.gamakatsu.com/product/magic-eye-tuna-plug-3x/).
It is difficult to predict future changes or improvements to hook technology because companies are inclined to protect proprietary information. However, an informal survey of patents on Google Scholar revealed continued innovation related to reductions in the loss of fish, and increased capture efficiency. For example, a recent patent outlined the use of dual barbs on a fish hook “making it more difficult to dislodge the hook while recovering a hooked fish” (Lee 2017); another described a hook with multiple barbs that results in “increased and more secure hookups” (Winter 2017). Patents also exist for integrating attractants into fish hooks, intended to attract fish and increase capture rates (Wang 2016) (See the Fish attractants section), as well as for the use of fluorocarbon hooks that are transparent or translucent but strong (Lorimer and Ray 2016). In addition to efforts that are intended to increase capture rates, work is also underway to have hooks minimize negative effects on captured fish including making hooks less corrosion-resistant when ingested and re-designing barbless hooks to improve safety (Yepez and Guevara 2017), and to integrate antimicrobial coatings and/or an anti-inflammatory coating to minimize infection, treat the puncture wound, and minimize nociception for captured fish (Hopkins 2017). Novel hook mounts have also been created to increase hook exposure and ultimately capture rates (Bursell and Arlinghaus 2018). In addition to hooks, there have been innovations in bait clips that allow anglers to cast the sinker out and then clip a large bait on to the line and slide it out which has enabled anglers to access fish (e.g., Lichia amia) that were previously inaccessible (Maggs et al. 2016).
Implications for recreational fisheries governance
When examined as a whole, recent and potential changes to hook technology, are heavily skewed towards increasing capture rates and minimizing the loss of hooked fish. This may have policy and management implications if anglers are sufficiently effective as to maintain elevated catch rates despite reduced population sizes, or if previously invulnerable species/size classes of fish become targets for anglers. Managers should therefore be aware of how fish hook technology could impact fish populations through increased capture. There is certainly opportunity for fisheries managers to work more closely with hook manufacturers in an attempt to develop “solutions” that work for specific fishing scenarios or issues. It is common for angling regulations to specify the number and types (e.g., single, treble) of hooks that an angler can use on a line, and whether barbs are allowed, but to omit finer details related to the hook design (e.g. colour, material, number of barbs). Definitions can sometimes be an issue. For example, when the Atlantic States Marine Fisheries Council decided to require circle hooks for striped bass, they had to first define “circle hook” so that there was an enforceable regulation. In the end, they opted to simply identify specific makes and models of hooks that were considered to be circle hooks when unmodified. Fisheries managers should also pay close attention to hook types that may increase hooking and landing rate, but do so with a cost to the fish in terms of greater injury or longer handling times (e.g., multi-barb hooks could potentially represent such an example).
The technology and its application
Attempts by recreational fishers to utilise scents to stimulate the well-developed olfactory (smell) and gustatory (taste) organs of fish to increase their catch rates are probably as old as recreational fishing itself. Subsistence fishers used natural organic bait for thousands of years to attract and catch fish, so the commercial development of scent products early in the development of the recreational fishing industry (e.g. Fish Lure Corp. 1954) was expected. However, modern scientific understanding of fish physiology and nutrition has provided precise insights into the roles of the various chemical compounds that are associated with attractive and repellent behaviours in feeding fish (Loeb 1960; Mackie 1982; Carr and Derby 1986; Hara 1994; Kasumyan and Doving 2003; Kasumyan 2019). This research has found that fish respond to various water-soluble substances including amino acids and their derivatives, small peptides, amines, nucleotides, inorganic salts, sugars, carboxylic, and bile acids. This body of research also found that the effective combinations of palatable, aversive, and ineffective compounds often differed markedly among fish species (Carr and Derby 1986; Hara 1994; Kasumyan and Doving 2003; Kasumyan 2019).
Research into fish chemoreception was largely unexploited by the recreational fishing tackle industry until the mid-1980s. Nearly all of the so called "fish scents" on the market in the 1980s were based on various fish oil formulas, which were insoluble in water and thus incompatible with the olfactory and gustatory organs of fish (Carr and Derby 1986; Hara 1994; Kasumyan and Doving 2003). These products thus acted mainly as masking agents designed more to "attract fishermen rather than fish” (Field and Stream 1986), and their poor attraction performance led to widespread scepticism amongst anglers in relation to the effectiveness of fish attractants. But no scientific study is available to back these claims. Relatedly, in the carp angling industry alcohol-based flavours proliferated during the same time, carrying immense variation in smell and tastes to be added to paste-based baits for non-piscivorous fish. Again, no scientific study on the relative performance of flavoured and unflavoured baits exists. A more scientifically rigorous approach to the development of fish attractants emerged in the mid-1980s as scientists began working with fishing tackle companies such as Berkley (see Jones 1989, 1990) to develop synthetic products such as Strike attractant spray and Power Bait poly vinyl chloride (PVC) soft plastic lures that contained scientifically proven water soluble fish attractant compounds. The commercial availability of these products finally allowed anglers to reduce reliance on fish oils (http://www.berkley-fishing.com/Berkley-ae-fish-attractants-leave-the-oil-at-home.html), but may have led to other problems including ingestion of damaged or discarded scented soft plastic lures by wild fishes (Danner et al. 2009).
Acknowledging the potential pollution and fish health issues associated with the loss of plastic lures into the aquatic environment, research in the recreational fishing industry continued to evolve in the early twenty-first century with development of various artificial soft baits from biodegradable materials, which can exude attractants into the water at much higher rates (up to 400x) than traditional PVC soft lures, thus approaching or even exceeding the attractant concentrations exuded by natural baits. Such products included Berkley Gulp, Food Source, Atomic Guzzlers, and Rapala Slam baits (Schultz 2004; Merwin 2007; Savvas 2009). Since the introduction of these scientifically formulated fish attractant products, their effectiveness for attracting fish has become more readily accepted by recreational anglers, who are now able to compare their performance against the traditional fish oil derived products (Savvas 2009) (https://blog.fishingtackleshop.com.au/fish-attractant-scents/). Nevertheless, a laboratory study of the effectiveness of 21 commercially available fishing scents conducted in 2007 utilising a range of Australian fish species (Acanthopagrus australis, Chrysophrys auratus, Lates calcarifer and Macquaria novemaculeata) found that 19 out of the 21 products did not significantly influence the behaviour of the experimental fish, or were mild repellents and hence were ineffective (BK Diggles, unpublished data). Because much of the work on fish attractants is proprietary, there is little available “open” science on this topic.
Implications for recreational fisheries governance
The main management and policy implications of this technology relate to the potential for increased fishing efficiency and post-release mortality due to hooking damage caused by fish ingesting scented lures and baits deeper than if they were caught using unscented lures or bait. The former concern has already led the state of Minnesota to ban the use of “bait cloud” fish attractants and similar products that are intended to attract fish and enable capture (see https://www.dnr.state.mn.us/regulations/fishing/baitcloud.html). The latter concern may result in bans on the use of scented lures in certain areas or jurisdictions. For example, Schisler and Bergersen (1996) found that rainbow trout (Oncorhynchus mykiss) had between 5.5 and 8.2 times higher hooking mortality rates when caught using scented artificial baits (Power Bait) that were fished actively or passively, respectively, compared to artificial flies. This study led to bans on the use of scented artificial baits or any chemical attractants in some “lure only” management jurisdictions (e.g., in some National Parks in Canada; See https://laws-lois.justice.gc.ca/eng/regulations/C.R.C.,_c._1120/FullText.html).
In contrast, Dunmall et al. (2001) studied the hooking locations and post-release mortality of smallmouth bass (Micropterus dolomieu) that were caught using minnows, nonscented plastic grubs, or grubs scented with chemical attractants (salt, Power Bait (scented PVC lure), or oil of anise). They recorded 0% mortality and found that the type of bait used to capture the fish had no significant effect on the depth of hook penetration or the anatomical hooking location. However, fish attractants can be highly species-specific, and while oil based attractant products are unlikely to influence the gustatory behaviour of fish, the PVC Power Bait type lures studied by Dunmall et al. (2001) have been surpassed by the more recent biodegradable lure technology that has been advertised as having upwards of 400× more scent dispersion (Berkley/Pure Fishing data). Hence the results of Dunmall et al. (2001) may not reflect the current reality, and indeed the deep hooking frequencies for today’s scented lures may be similar to those usually observed using organic bait for certain fish species (Diggles et al. 2020).
There is also the possibility that the use of effective fish attractants will increase the frequency of ingestion of discarded or lost scented lures by wild fish, which may result in reduced growth rates or other adverse health effects if the ingested lures are not digestible or biodegradable (Danner et al. 2009; Raison et al. 2014) and cannot be passed through the digestive tract (Sanft et al. 2018). Even still, lures made from biodegradable materials may persist virtually unchanged for at least two years underwater (Raison et al. 2014). At least some of this slow degradation is likely to be due to the reduced oxygen availability underwater compared to the normal biodegradation standards applied to materials composted on land (BK Diggles, unpublished data). However, again, the results of any such studies are likely to be specific to the fish species, lure material, and attractant products examined. Furthermore, the use of scented artificial baits provides several advantages for managers, not the least being the elimination of bait bucket transfer (Ludwig and Leitch 1996) and the many significant biosecurity and pest translocation risks associated with use of organic baits (Diggles 2011; Scott-Orr et al. 2017), as well as the reduction of harvesting pressure on natural bait species. For these reasons, it is impossible to arrive at any general conclusions on the management and policy implications arising from increased use of effective fish scents by recreational anglers at this point in time, except to anticipate that research to develop improved artificial baits and fish attractants is likely to continue.
Lure and bait technology
The technology and its application
Fishing tackle manufacturers have long attempted to create artificial lures or enhance organic baits that attract the attention of both fish and the angling consumer. Dr. Loren Hill’s Color-C-Lector from the early 1980s was one of the first attempts to introduce science and technology into lure manufacturing. This handheld device used water clarity relative to ambient light and depth (and eventually pH) to recommend colors that would be most visible to fish. Several lure manufacturers aligned their own lure color options with those recommended by the Color-C-Lector. At about the same time, the Banjo Minnow (see https://www.asseenontvvideo.com/511810/Banjo-006-Minnow-Fishing-Lure.html), a soft plastic lure, was being marketed aggressively (e.g., “as seen on TV”) using phrases like “the most lifelike fishing lure ever created” and “it triggers a genetic response and compels fish to bite even if they are not hungry”. There were also attempts to incorporate “guanine” (a biological compound that occurs in fish scales) into lure paint in what became known as the “G-finish”. These early attempts paved the way for other innovations that may be relevant to managers. For example, some lures also use a “photo” finishing process where actual images from baitfish are incorporated into lure finishes rather than simple painting. In addition, a number of new lures have incorporated battery-powered LED lights that illuminate the lure or flash for use at depth or at night or have used UV sensitive materials that are supposed to be sensed by fish better at depth or with certain illumination. Similarly, many lures also incorporate glow-in-the-dark paint, although they require exposure to light in order to “charge”. There have also been recent developments with “robotic” lures (e.g., https://roboticlure.com/) that features action that is apparently enticing to fish. Some lures even use solar-powered micro-electronics to vibrate (https://biteemsolarlures.com/). There have also been recent innovations in devices that are inserted into dead bait (e.g., a dead baitfish) to make it move (https://www.kickstarter.com/projects/1029637745/zombait-a-robotic-lure-that-brings-dead-fish-back). Noise has been a common aspect of lure design using rattles or clackers. However, use of electronics has created new opportunities for manufacturers to incorporate realistic (potentially playbacks) sounds from baitfish to potentially improve capture of target fish (see electronic baitfish sound system from Livingston Lures; https://www.livingstonlures.com/learn/our-technology). There have been attempts to incorporate “fish attracting voltage” (also termed “voltage tuned”) into lures (e.g.; https://www.lurecharge.com/intro-products; https://www.youtube.com/watch?v=nEKaHcy36Is) but this is a reasonably new phenomenon and we are unaware of any published research on its efficacy or effects on fish.
Organic bait innovations have also occurred with a focus on better preservation of baitfish and crustaceans. Although initial efforts were driven largely by the bait industry and their interest in creating opportunities to preserve bait for shipping and sales without the complexity of keeping bait alive, more recently such work has been sponsored by governments in an attempt to overcome biosecurity issues related to accidental or intentional release of live bait. For example, the natural resource management agency in Quebec banned use of live bait fish by recreational anglers in 2017 and prefaced that action with research focused on demonstrating how bait fish could be best preserved to enable the storage and use of dead bait fish (https://www.quebec.ca/en/tourism-and-recreation/sporting-and-outdoor-activities/fishing-rules/fishing-techniques/). While preservation of artificial baits can be much longer than for organic baits, some of the storage solutions can be toxic to fish (Rapp et al. 2008). In Wisconsin, the Department of Natural Resources has shared information (see https://dnr.wisconsin.gov/sites/default/files/topic/Fishing/VHS_vhs_sellingfrozenbait.pdf and https://dnr.wisconsin.gov/topic/Fishing/vhs/vhs_preservation.html) on preservation methods for organic baits that reduce likelihood of spreading the disease Viral Hemorrhagic Septicemia via bait fish given that freezing alone is insufficient to kill that virus.
Implications for recreational fisheries governance
Lure and bait innovations involving electronics or mechanics that generate light, noise, or movement are most likely to be of interest to fisheries management and policy. Use of lights for night fishing is often restricted in recreational fisheries, so extending that to include lighted lures could be relevant in some contexts. Similarly, the use of enhanced lures (or devices that cause dead bait to move) may be deemed to give the angler an unfair advantage to the point where the activity is no longer consistent with the spirit of recreational fishing. Ultimately, this is only an issue if it leads to improvements in catch (and harvest) or contributes indirectly to fishing mortality via hooking mortality, for which there is no scientific study. For example, if lures that include light, noise, electricity, or mechanical aspects are indeed more realistic then they could be more deeply ingested by fish, possibly creating problems in catch-and-release fisheries. We are unaware of any jurisdictions with regulations that restrict such lures at present. In Minnesota, any batteries contained in lures must not contain mercury (https://www.revisor.mn.gov/statutes/cite/97C.335). In catch-and-release fishing more “flashy” and “noisy” lures, will lead to faster hook avoidance learning will be achieved, such that some of the gear innovations might quickly loose their catch potential. Moreover, in some instances there may be benefits to limiting the use of certain tactics. For example, lures that behave like live bait—or the use of devices that make live bait move and seem alive even when dead—could be effective replacements for live bait that may be regulated because of issues with biosecurity, fish introductions, or endangered species. The use of lures with “fish attracting voltage” is potentially problematic in that there may be sublethal physiological consequences for fish that are to be released. In most jurisdictions, the use of “electricity” for fishing (i.e., electrofishing) is restricted to fisheries scientists and assessment biologists (e.g., in Mississippi; https://www.mdwfp.com/law-enforcement/fishing-rules-regs/- yet there is no mention of electrified lures) so it may be reasonable to consider extending to specify lures that emit electricity if deemed necessary. That said, the level of electricity generated by these devices is presumably quite low and therefore may not be an issue. Innovations in bait fish preservation are generally deemed to be beneficial and provide fisheries managers with new tools for limiting spread of non-native bait as well as diseases they may carry.
Fishing rod, reel and line technology
The technology and its application
Fishing rod technology has focused largely on making rods that are lighter and more sensitive (e.g., with IM8 graphite) than early (e.g., bamboo, fibreglass, and boron models) or less expensive rods while also retaining or increasing strength and reaction characteristics. Recently, the first Bluetooth-enabled fishing rod was released, which allows anglers to immediately record aspects of their catches through a linked app (see: https://www.outdoorhub.com/news/2019/07/22/abu-garcias-virtual-rod-first-ever-bluetooth-enabled-fishing-rod/; note—this is most relevant to the smartphone section so is discussed below). Reels have also become much lighter, with an emphasis on mechanics that enable long-distance casts, more efficient line retrieval and better drag systems. Some baitcasting reels now include a digital micro-controller that allows the angler to cast into the wind without issue. There have also been developments in some level-wind reels that retrieve line and reel in a fish with the push of a button—typically employed in deepwater environments. Some reels also have an automated jigging feature to make lures/bait look lively (https://www.sportfishingmag.com/techniques/rigs-and-tips/power-play/). In fly fishing, technology has allowed for the advance of stronger, more efficient drag systems (e.g., carbon), that improve the ability of anglers to land fish, even those of considerable size (e.g., large sharks, Atlantic tarpon [Megalops atlanticus], Atlantic bluefin tuna [Thunnus thynnus]).
Fishing line is another important aspect of the rod and reel setup. New lines are often thinner yet stronger than those of yesteryear (https://www.in-fisherman.com/editorial/trends-in-fishing-line/154077). Early fishing lines were made of braided natural materials (e.g., horsehair, cotton) that were replaced largely by monofilament nylon until innovations in braided line technology brought that line back to the fore in the 1990s. The new generation of braided “super” lines (gel-spun, hollow core) bring strength (including resistance to abrasion) while doing so with smaller diameter. These lines also provide more sensitivity and reduce stretch such that it is possible to fish with more line out (e.g., deeper or further) while still being able to feel the bite. Traditional monofilaments made from nylon are now competing with fluorocarbon lines that claim to be nearly invisible to fish. The same is true for fly fishing lines, with advanced materials and fly line tapers being developed and used to improve casting, increase sensitivity, and reduce the ability for fish to see the line. Some manufactures are also taking a technological approach to make more environmentally friendly fly lines, rather than relying on PVC and other materials that weather through the production process or when loss in a lake or stream can have hazardous effects on biota.
This collective suite of rod, reel, and line innovations provides the angler with a number of advantages over gear from the past—mostly by allowing the angler to become less fatigued while accessing or covering more water and doing so with lines that are tougher, less visible, and more sensitive. There have also been innovations in fishing “systems”—how rod, reel, and line are deployed. For example, ice fishing devices that automatically set the hook for the angler (https://mailtribune.com/lifestyle/ice-fishing-invention-hooks-anglers) and downriggers and kites that adjust depth automatically through links to smartphone apps and boat electronics (e.g., GPS and depth finder).
Implications for recreational fisheries governance
At present, the most important message for the manager and policy maker is that innovations in rod, reel, and line technology can provide anglers with access to waters that were previously not “fishable” (especially very deep water). As such, there may be need for new recreational fishing regulations for species that had previously been deemed to not be at risk as a result of recreational fisheries interactions. Additionally, anglers may have higher effort and total catches if innovations reduce fatigue. Other issues related to rod, reel, and line choice are somewhat challenging to consider in terms of regulatory options. The exception would be the automation of reels or other devices that assist with getting a lure/bait to depth, or making it move in a certain way (including the hook set). These tools already exist (e.g., electric reels) and are used in some specialized fisheries. For example, California forbids the use of winches while angling, but permits the use of electric reels (http://www.eregulations.com/california/fishing/saltwater/finfish-fishing-gear/). Alaska and New South Wales Australia failed to prohibit power-assisted reels (https://www.ktoo.org/2012/02/28/fisheries-board-keeps-powered-reels-legal/; http://www.fishingworld.com.au/news/fw-comment-shame-acorf-shame) whereas such gear is restricted (except for exemption for disabled anglers) in Canada for anglers who target halibut in Pacific waters (https://www.sportfishingbc.com/forum/index.php?threads/electric-fishing-reels.34872/).
The technology and its application
There has been a recent push to improve the welfare of fish that are captured-and-released by anglers (Danylchuk et al. 2018) as recognition grows that handling practices can influence the physiological stress and survival of released fish (Brownscombe et al. 2017). This includes a wide array of devices used to land, unhook, and promote recovery of captured fish. Tools such as pliers have conventionally been used to unhook fish, but more recent innovations include lip gripping devices (used to secure a fish by the lip while taking out the hook) and dehooking devices that allow fish to be released without being touched by the angler or removed from the water (see many patents filed for dehooking devices; Harrison 2004; Baiamonte and Wegner 2010; McFann and McFann 2010). Recent advancements in lip gripping devices also include products to help to handle large fish (e.g., tuna) that are landed from boats with high freeboard, which could potentially help with fish recovery and release (e.g., Seanox Big Game Pliers, https://www.pechextreme.com/en/other-pliers/3062-seanox-big-game-pliers-for-tuna-3541100765040.html). Lip gripping devices have become common, but their use remains controversial for some species given that there is evidence of high rates of mouth injury associated with their use (Danylchuk et al. 2008; Gould and Grace 2009). Net technologies have developed greatly from knotted nylon nets to the rubberized, knotless nets that minimize epithelial damage during landing compared to other landing net materials (Colotelo and Cooke 2011). Unhooking mats have been designed for hook removal of common carp with many different varieties available including ones that are padded and include inflatable edges. Various technologies have also been designed to retain landed fish in water (e.g. fish cradles, recovery bags, live wells) while anglers prepare measurement tools or cameras. Fish cradles result in fish retention directly in the water body, whereas live wells store fish on a boat, with surrounding water pumped or spilled directly into the well. Live wells are often used for longer holding periods associated with angling tournaments but could also be used in the case of high grading when there are bag limits or slot limits. Although the premise of a live well is to keep fish alive, survival can be compromised when they are not operated properly and create hypoxic conditions (Keretz et al. 2018). Recent innovations include the use of padding to reduce injury of fish during transport (Brooke and Tufts 2012). There are also chemical live well additives marketed to anglers to improve the recovery of fish following capture (i.e., sedating catch, replacing the slime coat, healing wounds, and reducing weight loss). Scientific evaluations of these products are limited, and have not reached a consensus on whether they are beneficial or detrimental (Cooke et al. 2002; Gilliland 2003; Ostrand et al. 2011). There have also been attempts to develop analgesics that can be applied to areas of the fish where the hook penetrated in an attempt to address nociception issues (e.g., Catch and Relieve spray) or disinfect the fish (e.g., often used by European anglers targeting carp), but it is unclear if these products have any benefit or if they introduce chemical residues in fish that endanger the public.
In many cases, innovations have been designed to improve the ease of fish handling, but may not reduce harm to the fish itself. Fish handling gloves are designed to get a firm grip on slimy fish and to prevent cuts and punctures to the angler, though there have been few studies evaluating the impacts to the slime layer across species’ and glove types (but see Murchie et al. 2009). And in European carp angling, anglers are using so called unhooking mats to keep the fish under water and avoid mucus abrasion during dehooking and the making of memorable pictures. Various recovery tools exist to try and increase the survival of captured fish. As previously mentioned, recovery bags can be used to hold fish prior to release, allowing fish to recover reflex ability, reduce behavioural impairment, and lower predation risk (Brownscombe et al. 2013). Trophy carp anglers often use de-hooking mats for hook removal (Rapp et al. 2014). Fish may experience barotrauma when angled (particularly when brought up quickly from depth), leading to organ damage (Rogers et al. 2008) and an inability to return to depth upon release. Devices to ‘vent’, ‘fizz’ (i.e. puncture the swim bladder to release expanded gases), or rapidly recompress fish are available to return fish to neutral buoyancy. A review on the efficacy of venting on captured fishes indicated that this strategy is generally not beneficial (Wilde 2009), though there is evidence that it can be beneficial for some species (Drumhiller et al. 2014). Fish recompression works by lowering fish back to appropriate depths with descending devices (e.g. weighted lines and inverted hooks or weighted baskets with open bottoms), allowing swim bladder gases to recompress. Descending devices (e.g. https://seaqualizer.com/product/seaqualizer-descending-device/) have proven highly effective across species (Butcher et al. 2012; Drumhiller et al. 2014; Bellquist et al. 2019) and avoid the potential of damaging organs during the venting process (discussed in Wilde 2009). Other recovery measures used by anglers include the pouring of carbonated beverages (e.g. Mountain Dew) on actively bleeding gill arches. This recovery measure is based on the untested hypothesis that the acidity of these beverages can cauterize the wound and stop bleeding, though the potential for this acidity to damage sensitive gill tissue is equally likely (https://theoutdoorforum.net/index.php/2017/10/05/the-fishing-line-stop-pouring-soda-on-fish-gills/). This technique is not being promoted by the carbonated beverage industry; rather individual anglers and some media outlets have caused it to go viral prior to it being validated.
Implications for recreational fisheries governance
There is strong potential for fish care technologies to benefit the welfare of fish that are intended for release (because of mandated regulations or voluntary actions), though the opposite is possible if technology is improperly incorporated into the recreational fisheries management toolbox. Many of the technologies that are available to improve fish care have yet to be formally evaluated, limiting the ability of fisheries managers to make evidence-based decisions on their implementation or prohibition in recreational fisheries. The value of these technologies is also likely to be context- and species-specific (Cooke and Suski 2005; Raby et al. 2015), so it can be difficult or even inappropriate to apply findings from one setting to another. When available, managers should rely on evaluations that most closely mimic the fishery in question (i.e., species, methods, gear, environmental conditions). A review of management agency websites indicated that it is common for unevaluated or contentious practices/technologies to be recommended to anglers by natural resource agencies (Pelletier et al. 2007). In the absence of reliable information, it may be advisable for managers to implement a precautionary approach and prohibit technologies until their efficacy can be evaluated, without creating barriers to fishery access (Hilborn et al. 2001). Nonetheless, there are many fish care regulations that managers could implement (and have implemented) that would undoubtedly benefit released fish across contexts, including the mandatory use of pliers or dehooking devices, knotless rubber nets, and descending devices where barotrauma is common. For example, dehooking devices (e.g. pliers) are required when angling for reef fish (e.g. snapper, grouper) in State Waters of the Gulf of Mexico and the Atlantic (Florida Fish and Wildlife Conservation Commission). Descending devices are a requirement under British Columbia’s 2019–2020 Tidal Waters Sport Fishing Licences to increase the post-release survival of decompressed rockfish (Fisheries and Oceans Canada 2019). In some cases, the technology itself could benefit fish, but only if used correctly. As such, education efforts at improving angler awareness alongside or instead of regulations may be critical. A great example is the inclusion of compressed oxygen in modern bass boat live wells. When used to keep oxygen at 100% saturation it can be beneficial but supersaturation is possible which can have negative consequences for bass in live wells (Suski et al. 2006). One area that requires careful monitoring by regulatory agencies is the chemicals that fish are exposed to during live well retention or for “pain management”. Such substances might be harmful to humans if they enter the human food system—an issue that likely extends beyond natural resource management agencies to include public health and food safety organizations (e.g., US FDA, Canada Food Inspection Agency, Health Canada).
Social media and online forums
The technology and its application
The popularity of social media accelerated in the first decade of the new millennium. This came as a response to the World Wide Web evolving from a platform hosting mainly static information to one that includes a great deal of user generated content, which is considered the lifeblood of social media (Obar and Wildman 2015). Most social media platforms allow users to create a profile that connects to a website or an app that is maintained by a social media service, e.g. Facebook, Twitter, Snapchat, Instagram, or WhatsApp. User profiles can be considered the backbone of social media because they enable social network connections between user accounts (Obar and Wildman 2015). Social media has become wide spread within a short period (e.g. 69% of the US population used Facebook in 2019 (https://www.pewresearch.org/fact-tank/2019/04/10/share-of-u-s-adults-using-social-media-including-facebook-is-mostly-unchanged-since-2018/), and has significantly changed the ways that humans interact. Clearly, social media has also affected the way that anglers interact; today, thousands of social networks share angling related information by the minute. This includes practical angling information (where to fish, what fish species, etc.) as well as political/opinion information when social media is used to promote and debate governance, regulations, policies, pollution, ethics, and codes of conduct. The rapid use and development of social media in recreational fisheries clearly provide a huge source of information both for anglers and researchers (Monkman et al. 2018a). This knowledge can be harvested by so-called net scraping technologies that use code to search homepages and online forums for specific content. The data can then be applied in culturomics studies to understand trends in resource use patterns and user attitudes (Jarić et al. 2020; Sbragaglia et al. 2020).
Implications for recreational fisheries governance
The emergence of social media has provided anglers with easy access to a large flow of information from peer anglers about all aspects of recreational fisheries, e.g. where to fish and what gear to use. In addition, researchers and managers increasingly share research and management information through social media, which therefore also becomes easy to access by the angler. When the information shared with the angler is true and correct, the anglers may increase their knowledge. In time, such a knowledge boost among and within anglers is likely to increase angler empowerment, i.e. qualify them to challenge and influence the management of their fisheries. This can lead to new and more dynamic and interactive co-management regimes, where information is swiftly shared among managers, researchers and anglers, and where anglers are more involved in decision making and management (Arlinghaus et al. 2019). This will likely increase the transparency of management decisions, increasing trust from anglers. However, misinformation on social media platforms can have negative implications for recreational fisheries management. For instance, it has been widely circulated by anglers that pouring carbonated beverages on injured fish will help reduce injury and increase survival despite no empirical evidence to back this claim. An experimental evaluation of this claim revealed that this practice was actually more harmful to captured fish (Trahan et al. 2020). Further, misinformation from anglers about fishing regulations on social media can negatively influence perceptions within the fishing community and managers may find it necessary to provide correct information on the social media fora. Moreover, if managers engage in “putting out fires” on social media, they have to balance if they are managing the vocal minority or the silent majority (the two groups may or may not be aligned). Traditional surveys with a random sampling frame are needed to sort this out (e.g. Jones and Pollock 2012).
Information sharing among anglers can be voluntary, e.g. when anglers discuss and share fishing spots in open or closed Facebook groups. However, unwanted information sharing can also occur which may lead to controversy related to potentially revealing prime fishing locations (discussed above) and diluting the sporting nature of the act of fishing, overall. In an interesting example from Ontario, Canada, an angler posted an image of a trophy-sized fish that they caught in a “secret” lake within the 7653 km2 Algonquin Provincial Park. Another angler filed a freedom of information request for the angler’s camping permit in an attempt to learn which lakes he had fished in (https://www.cbc.ca/news/canada/thunder-bay/foi-request-fishing-spot-1.4232556). If images contain identifying landmarks or are not scrubbed of meta-data, then they may provide clues or detailed information on where fishing occurred; for example, many cameras and cellular phones automatically georeference photographs, which can reveal locations to others. Regardless of the form, the rapid sharing of data via social media can lead to rapid increases in fishing pressure in particular areas. In its extreme, this pressure can result in localised overfishing with associated ecosystem and social consequences, e.g., loss of angler utility (e.g. Arlinghaus et al. 2017b). Alternatively, data sharing on social media may increase public awareness of fish and fisheries, potentially leading to positive public perceptions of fish that could influence pro-environmental behaviours and/or greater support for policies that support their conservation (Danylchuk et al. 2018).
A recent study argued that the future governance of recreational fisheries would benefit from a stronger organization of anglers, e.g. angler clubs and associations (Arlinghaus et al. 2019). In some countries (e.g. Denmark), anecdotal information suggests that member numbers in angling clubs have decreased in recent years. Historically, angling clubs have had an important role in facilitating information sharing among anglers, e.g. about where and when to fish, what to fish with and where to buy access to waters. It is easy to imagine that much of the information previously shared at club meetings and other fishing club gatherings has been replaced by social media fora, which to some extent has made fishing club memberships superfluous. Anecdotal information, e.g., from angling clubs in Denmark suggests that younger people in particular are not joining fishing clubs, which could relate to a generation of “digital natives” i.e. people born in or after the 1990s. This so-called “Generation C” live “online” most of their waking hours. Here, they participate in numerous social networks with several hundred or more contacts, generate and consume vast amounts of formerly private information, and carry with them a sophisticated “personal cloud” that identifies them in the converged online and offline worlds (https://static1.squarespace.com/static/5481bc79e4b01c4bf3ceed80/t/548775e3e4b04e84900ab161/1418163683616/Rise_Of_Generation_C.pdf). Time will show if and how the social role and the information-sharing-role of angling clubs will be replaced by online organised fora. Alternatively, a counter response may emerge wherein personal, face-to-face relationships again will increase in attractiveness, paving the way for increased recruitment to angling clubs.
Recreational fisheries often suffer from data poverty (Arlinghaus et al. 2019), and net scraping from social media can provide novel information about the species present (e.g. seasonal patterns) in a water body and to some extent the length/weight information. Similar, data mining, e.g. the process of discovering information, patterns in datasets that involves different machine learning, can provide knowledge to managers from data poor fisheries. An example is provided by Sbragaglia et al. (2020), who used YouTube data mining to explore differences in harvest patterns and social engagement between recreational anglers and spearfishers. Although net scraping and data mining are useful tools, there are also challenges with the methodology, e.g. legally, practically, and ethically (Monkman et al. 2018b).
The technology and its application
It stands to reason that most recreational anglers (especially the next generation of anglers) have a smartphone with them while fishing. Smartphone ownership is approaching 50% globally and 80% in advanced economies (www.pewresearch.org/global/2019/02/05/smartphone-ownership-is-growing-rapidly-around-the-world-but-not-always-equally/), and most users depend on the technology for daily life (e.g., Ward et al. 2017; Foreman-Tran et al. 2020). Smartphones are a net safety benefit (Yared et al. 2015), allow anglers to take photos and monitor conditions, and can extend fishing opportunities by allowing anglers to remain available and productive while away from the home or office (Kalkbrenner and McCampbell 2011). Smartphones are also a convenient interface with, and extension of, many of the technologies that are featured in this paper (e.g., cameras, ROVs, navigational equipment, smart devices). Particularly relevant to fisheries management and policy are the many applications (also known simply as “apps”) that support private or public catch logging, and specialized social networking (Venturelli et al. 2017; Bradley et al. 2019). Catch log fields vary among these apps (Venturelli et al. 2017), but typically include date, time, location, conditions, method of fishing (e.g., boat vs. shore, type of lure), species, size, and fate. These data are often summarized as personal and relative statistics, and used in aggregate to offer popular features such as fishing reports, forecasts, and maps that can inform decisions about where, when, and how to fish. Other common features include digital licensing, regulation information, species identification, and virtual tournaments.
Implications for recreational fisheries governance
Smartphone use by anglers is both a challenge and an opportunity for fisheries science and governance. For example, using smartphones to photograph or videotape fish and/or record catch information can prolong handling times, and may translate into higher rates of post-release mortality (Joubert et al. 2020). This effect of smartphone use is most likely among species or sizes that are most vulnerable to catch-and-release mortality, and in high-effort, catch-and-release fisheries. However, estimating the impact of smartphone use on any fishery requires careful study—not only to establish a relationship between handling time and release mortality—but to understand how this relationship varies with important ecological conditions (e.g., temperature) and other catch-and-release practices (e.g., hook characteristics) (Joubert et al. 2020). Management options to address incremental mortality associated with using smartphones to document fishing catch include angler education, smartphone regulation, and effort reduction; however, identifying the most appropriate combination of actions will likely require human dimensions research and adaptive management.
Using smartphones to share photographs and data in near real time has important management and policy implications. The traditional image of recreational fishing as a solitary and secretive pursuit does not apply to the growing number of anglers who freely post catch information to social media. Angler apps are a popular and specialized form of social networking that emphasizes data sharing, discovery, and application in near real time. As described in the Social media section, access to a wealth of up-to-date information about where and how anglers are having success can concentrate effort and improve catch rates (see Schramm et al. 1998 for an “analog” example). A sudden influx of additional anglers can overwhelm the capacity of individual controls on angler effort and harvest (e.g., bag and length limits) to limit overall effort and harvest (Post and Parkinson 2012). Thus, smartphone use has the potential to strain local stocks and associated ecological systems and economies. Although preventing anglers from sharing catch information is a non-starter in most jurisdictions, it may be possible to limit the impact of the information that is shared through apps by legislating spatial or temporal averaging, or delayed reporting (Lindenmayer and Scheele 2017). As with many of the technologies that are described herein, smartphones can be used to inform anglers about stricter controls on effort and harvest—either in the form of reduced bag limits and/or altered length limits, or more direct approaches such as quotas, and tag systems. If the fishery is made up of numerous lakes, rivers, and/or streams, then these controls could be implemented as part of a regional management plan (Lester et al. 2003; Carpenter and Brock 2004; Hunt et al. 2011).
The information that anglers share via their smartphones is also a potentially valuable source of fishery-dependent data for both real time and post hoc analysis. This potential is already being realized among specialized social networking apps related to bird watching (Callaghan and Gawlik 2015; Kain and Bolker 2019) and cycling (Sun et al. 2017; Lee and Sener 2019). The value of smartphone data to a particular fishery will depend on the type, amount, and quality of the information that is collected, its availability to researchers and managers, and how it is analyzed and applied within management and policy frameworks (Venturelli et al. 2017). Initial research into the potential value of angler app data is both informative and encouraging. Papenfuss et al. (2015) used the movement patterns of individual anglers to reveal connectivity patterns among lakes in Alberta, Canada, and found a strong regional correlation between app- and mail survey-based estimates of effort that was not evident at the scale of individual lakes. Similarly, Jiorle et al. (2016) found that app- and creel-based catch rates were similar for some species when the app data were clustered by county. Data from this app have been incorporated into stock assessments for common snook (Centropomus undecimalis) (Muller et al. 2013). Finally, Liu et al. (2017) combine app and creel data within a capture-recapture framework to improve red snapper (Lutjanus campechanus) catch estimates in the Gulf of Mexico. In addition to serving as digital catch logs, smartphone apps can provide data that generate insight into angler behaviour, human dimensions, the economics of recreational fishing, aquatic ecology, the spread and impact invasive species, and climate change (Jarić et al. 2020). Realizing this potential will require cooperation among anglers, agencies, institutions, and industry to establish a large and reliable data stream. It also requires a strong commitment to research that identifies the strengths, weaknesses, benefits, and limitations of smartphone data (Venturelli et al. 2017).
Smartphones can change the way that anglers and agencies interact by creating opportunities for the two-way flow of information in near real time. For example, app use at certain places and times can trigger alerts that are designed to improve compliance with regulations (Mackay et al. 2018, 2019), encourage conservation behaviour (e.g., best handling practices, invasive species control), or improve safety. Alerts can also prompt anglers to report specific and accurate information, or complete surveys in support of management or research. Conversely, anglers can use their smartphones to push information to agencies; not only catch and effort data, but a diversity of timely and potentially relevant observations such as fish kills, tags or fin clips, injuries, poaching events, habitat degradation, (www.ishbrain.com/blog/fishbrain/collecting-trash-from-us-waters), and the presence of predators. Smartphones also facilitate direct collaborations between anglers and agencies (Mazumdar et al. 2018). Citizen science examples that rely heavily on smartphone apps include the Angler Action (www.angleraction.org) and Fangstjournalen (www.fangstjournalen.dtu.dk) catch logs, and a partnership between the U.S. Fish and Wildlife Service and the Fishbrain app (www.fishbrain.com) that encourages anglers to track invasive species (www.landscapepartnership.org/news/fishbrain-and-u.s.-fish-and-wildlife-service-partner-to-create-app-powered-citizen-science-engagement-opportunity-tracking-endangered-species). With enough research and participation, the rapid, two-way flow of information between anglers and agencies could even support an adaptive management approach that adjusts allowable harvest (fish size and number) in near real time based on the estimated impact of cumulative harvest on target reference points (Venturelli et al. 2017; Bradley et al. 2019). Although the emergence and success of such a management scheme is debatable, it illustrates the extent to which smartphones can re-shape fisheries management and policy. A more likely and immediate outcome of angler-agency communication and collaboration via smartphones is a much-needed increase in angler participation in the management process as well as increasing angler awareness about fish biology, fish care, and various regulations (Arlinghaus et al. 2019).