Abstract
The non-target bycatch of sharks in pelagic longline (PLL) fisheries represents a potential source of compromise to shark populations worldwide. Moreover, shark bycatch and depredation (damage inflicted on gear, bait, and catch) complicates management of sharks and other species, and can undermine the operations and financial interests of the pelagic longline industry. Thus, deducing means to reduce shark interactions is in the best interest of multiple stakeholder groups. Prior to doing so, however, the extent, cause and effect of these interactions must be better understood. In this review we address or conduct the following in relation to the U.S. Atlantic, Gulf of Mexico and Caribbean PLL fishery: (1) U.S. management governing shark interactions in the Atlantic; (2) the primary species encountered and historical shark catch data associated with PLL fishing in the Atlantic; (3) a historical comparison of area-specific shark species catch records between the two primary sources of shark catch data in this fishery; (4) the conditions and dynamics that dictate shark interactions in this fishery, and potential means to reduce these interactions, and; (5) a synthesis of the estimated impacts of this fishery on shark populations relative to other fisheries in the Atlantic. As has been found in other PLL fisheries, the blue shark (Prionace glauca) is clearly the shark species most commonly encountered in this fishery in the Atlantic, and receives the majority of attention in this review. U.S. management areas with high relative shark species diversities had a greater divergence in historical shark species percent-compositions between data sources (Pelagic Observer Program versus mandatory pelagic Logbook databases); this complicates the ability to conclude which species are most impacted by PLL fishing in those areas. The current fishing effort by the U.S. PLL fleet is small compared to that of PLL fishing targeting sharks in the Atlantic by non-U.S. fleets, and therefore poses a comparatively lower threat to the stability of Atlantic shark populations. However, incidental shark encounters are inevitable in U.S. Atlantic PLL fishing operations. Thus, it is in the best interest of all stakeholders in the Atlantic to better understand the extent and conditions governing these interactions, and to explore methods to reduce both their occurrence and those aspects leading to higher rates of incidental shark mortality.
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References
Abercrombie DL, Balchowsky HA, Paine AL (2005) 2002 and 2003 annual summary: large pelagic species. NOAA Technical Memorandum, NMFS SEFSC-529, 33 pp
Bacheler NM, Buchel JA (2004) Does hook type influence the catch rate, size, and injury of grouper in a North Carolina commercial fishery? Fish Res 69:303–311
Barker MJ, Schluessel V (2004) Managing global shark fisheries: suggestions for prioritizing management strategies. Aquat Conserv 15:325–347
Baum JK, Myers RA (2004) Shifting baselines and the decline of pelagic sharks in the Gulf of Mexico. Ecol Lett 7:135–145
Baum JK, Myers RA, Kehler D et al (2003) Collapse and conservation of shark populations in the northwest Atlantic. Science 299:389–392
Beerkircher LR, Cortés E, Shivji M (2002) Characteristics of shark bycatch observed on pelagic longlines off the southeastern United States, 1992–2000. Mar Fish Rev 64:40–49
Beerkircher LR, Brown CJ, Abercrombie DL et al (2004) SEFSC Pelagic Observer Program Data Summary for 1992–2002. NOAA Technical Memorandum, NMFS-SEFSC-522, 25 pp
Berkeley SA, Campos WL (1988) Relative abundance and fishery potential of pelagic sharks along Florida’s east coast. Mar Fish Rev 50:9–16
Berkeley SA, Irby EW Jr, Jolley JW Jr (1981) Florida’s commercial swordfish fishery: longline gear and methods. Florida Sea Grant Cooperative Extension Service MAP-14. Miami, FL, USA, 23 pp
Bonfil R (1994) Overview of world elasmobranch fisheries. Technical report, FAO, Rome, 341 pp
Borucinska J, Martin J, Skomal G (2001) Peritonitis and pericarditis associated with gastric perforation by a retained fishing hook in a blue shark. J Aquat Anim Health 13:347–354
Borucinska J, Kohler N, Natanson L et al (2002) Pathology associated with retained fishing hooks in blue sharks, Prionace glauca (L.), with implications for their conservation. J Fish Dis 25:515–521
Branstetter S, Musick JA (1993) Comparisons of shark catch rates on longlines using rope/steel (Yankee) and monofilament gangions. Mar Fish Rev 55:4–9
Brooks EN, Ortiz M, Beerkircher LK et al (2005) Standardized catch rates for blue shark and shortfin mako shark from the U.S. pelagic logbook and U.S. pelagic observer program, and US weighout landings. Col Vol Sci Pap ICCAT 58:1054–1072
Campana SE, Marks L, Joyce W et al (2005) Catch, by-catch and indices of population status of blue shark (Prionace glauca) in the Canadian Atlantic. Col Vol Sci Pap ICCAT 58:891–934
Campana SE, Marks L, Joyce W et al (2006) Effects of recreational and commercial fishing on blue sharks (Prionace glauca) in Atlantic Canada, with inferences on the North Atlantic population. Can J Fish Aquat Sci 63:670–682
Cooke JG, Beddington JR (1984) The relationship between catch rates and abundance in fisheries. IMA J Math Appl Med Biol 1:391–405
Cooke SJ, Barthel BL, Suski CD et al (2005) Influence of circle 540 hook size on hooking efficiency, injury, and size selectivity of bluegill with comments on circle hook conservation benefits in recreational fisheries. N Am J Fish Mgt 25:211–219
Cortés E (2002) Catches and catch rates of pelagic sharks from the Northwestern Atlantic, Gulf of Mexico, and Caribbean. Col Vol Sci Pap ICCAT 54:1164–1181
Cramer J (1997) By-catch of blue sharks (Prionace glauca) reported by U.S. pelagic longline vessels from 1987–1995. Col Vol Sci Pap ICCAT 46:456–464
Cramer J (2000) Large pelagic logbook catch rates for sharks. Col Vol Sci Pap ICCAT 5:1842–1848
Crowder LB, Myers RA (2001) Report to Pew Charitable Trusts: a comprehensive study of the ecological impacts of the worldwide pelagic longline industry. http://moray.ml.duke.edu/faculty/crowder/research/crowder_and_myers_Mar_2002.pdf. Accessed 19 Dec 2007
Department of Fisheries and Oceans Canada (DFO) (2002) Catch, bycatch and landings of blue shark in the Canadian Atlantic. In: DFO Science fisheries status report 2002/02E. http://www.mar.dfo-mpo.gc.ca/science/rap/internet/FSR(2002)2E.pdf. Accessed 19 Dec 2007
Diaz GA (2006) Estimation of large coastal sharks dead discards for the U.S. pelagic longline fishing fleet. ICCAT document LCS05/06-DW-18
Diaz GA, Serafy JE (2005) Longline-caught blue shark (Prionace glauca): factors affecting the numbers available for live release. Fish Bull 103:720–724
Domeier ML, Dewar H, Nasby-Lucas N (2003) Mortality rate of striped marlin (Tetrapturus audax) caught with recreational tackle. Mar Freshw Res 54:435–445
Food and Agriculture Organization of the United Nations (FAO) (1999) International plan of action for the conservation and management of sharks. Document FI:CSS/98/3, Rome, 26 pp
Garrison LP (2003) Estimated bycatch of marine mammals and turtles in the U.S. Atlantic pelagic longline fleet during 2001–2002. NOAA Technical Memorandum, NMFS-SEFSC-515, 60 pp
Gilman E, Clarke S, Brothers N et al (2007a) Shark interactions in pelagic longline fisheries. Mar Pol 32:1–18
Gilman E, Clarke S, Brothers N et al (2007b) Shark depredation and unwanted bycatch in pelagic longline fisheries: industry practices and attitudes, and shark avoidance strategies. Western Pacific Regional Fishery Management Council, Honolulu, USA. ISBN: 1-934061-06-9
Harrington JM, Myers RA, Rosenberg AA (2005) Wasted resources: bycatch and discards in U.S. Fisheries. In: U.S. Fisheries Atlas of Bycatch. Prepared by MRAG Americas, Inc. for Oceana, 286 pp
Hoey JJ, Moore N (1999) Captain’s report: multi-species characteristics for the U.S. pelagic longline fishery. National Fisheries Institute Report to NOAA, NMFS, Silver Spring, MD, USA. http://www.sefsc.noaa.gov/seaturtlecontractreports.jsp. Accessed 19 Dec 2007
International Commission for the Conservation of Atlantic Tunas (ICCAT) (2007) Report for biennial period, 2006–07, part 1, vol 2, 295 pp
Kerstetter DW, Graves JE (2006a) Survival of white marlin (Tetrapturus albidus) released from commercial pelagic longline gear in the western North Atlantic. Fish Bull 104:434–444
Kerstetter DW, Graves JE (2006b) Effects of circle versus J-style hooks on target and non target species in a pelagic longline fishery. Fish Res 80:239–250
Kerstetter DW, Pacheco JC, Hazin FH et al (2006) Preliminary results of circle and J-style hook comparisons in the Brazilian pelagic longline fishery. ICCAT document SCRS/2006/150
Mejuto J, García-Cortés B, De la Serna JM et al (2005) Scientific estimations of bycatch landed by the Spanish surface longline fleet targeting swordfish (Xiphias gladius) in the Atlantic Ocean: 2000–2004 Period. Col Vol Sci Pap ICCAT 59:1014–1024
Morgan A, Burgess GH (2007) At-vessel fishing mortality for six species of sharks caught in the Northwest Atlantic and Gulf of Mexico. Gulf Caribb Res 19:123–129
Moyes CD, Fragoso N, Musyl MK et al (2006) Predicting postrelease survival in large pelagic fish. Trans Am Fish Soc 135:1389–1397
Musick JA, Burgess GH, Cailliet G et al (2000). Management of sharks and their relatives (Elasmobranchii). Fisheries 25:9–13
National Marine Fisheries Service (NMFS) (1993) Fishery management plan for sharks of the Atlantic Ocean, 167 pp
National Marine Fisheries Service (NMFS) (1999) Final fishery management plan for Atlantic tunas, swordfish, and sharks, vol 1, 321 pp
National Marine Fisheries Service (NMFS) (2001) U.S. Plan of action for the conservation and management of sharks, 26 pp
National Marine Fisheries Service (NMFS) (2003) Final Amendment 1 to the fishery management plan for Atlantic tunas, swordfish and sharks. NMFS, Highly Migratory Species Management Division. http://www.nmfs.noaa.gov/sfa/hms/Amendment1/Final_EIS_Chapters/Chapter01.pdf. Accessed 19 Dec 2007
National Marine Fisheries Service (NMFS) (2006a) Final Consolidated Atlantic Highly Migratory Species Fishery Management Plan. NOAA, NMFS, Office of Sustainable Fisheries, Highly Migratory Species Management Division, 1600 pp
National Marine Fisheries Service (NMFS) (2006b) Annual report of United States of America. ICCAT document, ANN/2005/038
National Marine Fisheries Service (NMFS) (2007a) Draft Amendment 2 to the Consolidated Atlantic Highly Migratory Species Fishery Management Plan. NOAA, NMFS, Office of Sustainable Fisheries, Highly Migratory Species Management Division 470 pp
National Marine Fisheries Service (NMFS) (2007b) Animal log instructions. In: The Southeast Fisheries Science Center Animal log instructions for the Pelagic Observer Program. http://www.sefsc.noaa.gov/PDFdocs/Animlog.inst_07.pdf. Accessed 19 Dec 2007
Atlantic Pelagic Longline Take Reduction Team (PLTRT) (2006) Draft Atlantic Pelagic Longline Take Reduction Plan, submitted to NMFS. http://www.nmfs.noaa.gov/pr/pdfs/interactions/pltrp_draft_8June06.pdf. Accessed 19 Dec 2007
Rogan E, Mackey M (2007) Megafauna by-catch in drift nets for albacore tuna (Thunnus alalunga) in the NE Atlantic. Fish Res 86:6–14
Senba Y, Nakano H (2005) Summary of species composition and nominal CPUE of pelagic sharks based on observer data from the Japanese longline fishery in the Atlantic Ocean from 1995 to 2003. Col Vol Sci Pap ICCAT 58:1106–1117
Shark Defense (2007) Longline research; blue shark studies. In: Shark Defense’s chemical repellants page. http://www.sharkdefense.com/Fisheries/fisheries.html. Accessed 19 Dec 2007
Simpfendorfer CA, Hueter RE, Bergman U et al (2002) Results of a fishery-independent survey for pelagic sharks in the western North Atlantic, 1977–1994. Fish Res 55:175–192
Sisneros JA, Nelson DR (2001) Surfactants as chemical repellants: past, present, and future. Environ Biol Fishes 60:117–129
Skomal G (2007) Evaluating the physiological and physical consequences of capture on post-release survivorship in large pelagic fishes. Fish Manag Ecol 14:81–89
Stevens JD (1976) First results of shark tagging in the northeast Atlantic, 1972–1975. J Mar Biol Assoc UK 56:929–937
Stevens JD (1990) Further results from a tagging study of pelagic sharks in the Northeast Atlantic. J Mar Biol Assoc UK 70:707–720
Stone HH, Dixon LK (2001) A comparison of catches of swordfish, Xiphias gladius, and other pelagic species from Canadian longline gear configured with alternating monofilament and multifilament nylon gangions. Fish Bull 99:210–216
Ward P, Myers RA, Blanchard W (2004) Fish lost at sea: the effect of soak time on pelagic longline catches. Fish Bull 102:179–195
Watson JW, Epperly SP, Shah AK et al (2005) Fishing methods to reduce sea turtle mortality associated with pelagic longlines. Can J Fish Aquat Sci 62:965–981
Yokota K, Kiyota M, Minami H (2006) Shark catch in a pelagic longline fishery: comparison of circle and tuna hooks. Fish Res 81:337–341
Acknowledgments
For detailed worldwide perspectives regarding topics covered herein, we refer readers to the multinational report by Gilman et al. (2007b): Shark Depredation and Unwanted Bycatch in Pelagic Longline Fisheries (http://www.wpcouncil.org/pelagic/Documents/Shark-Longline_Interactions_Report.pdf as of December 17, 2007); and the truncated version of that report published by Gilman et al. (2007a). We acknowledge our co-authors (and respective funding sources) on both publications, most notably lead-author E Gilman for initiating this effort, fostering our involvement, and consolidating the case studies from around the world. We thank L. Beerkircher and D. Kerstetter for providing constructive comments on earlier versions of this manuscript. Funding for this work was provided by NOAA (via the Consortium for Wildlife Bycatch Reduction), and the New England Aquarium.
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Mandelman, J.W., Cooper, P.W., Werner, T.B. et al. Shark bycatch and depredation in the U.S. Atlantic pelagic longline fishery. Rev Fish Biol Fisheries 18, 427–442 (2008). https://doi.org/10.1007/s11160-008-9084-z
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DOI: https://doi.org/10.1007/s11160-008-9084-z