Movements and environmental preferences of the shortfin mako, Isurus oxyrinchus, in the southeastern Pacific Ocean
- 635 Downloads
Nine individuals of shortfin mako, Isurus oxyrinchus, were tracked in the southeastern Pacific Ocean, off northern Chile, by means of pop-up satellite archival tags. No common pattern was observed in their trajectories, apart from a movement onshore of all the fish tracked during June–August. The average estimated rate of movement was of c. 27 km day−1. Data were collected and processed for a total of 341 days, including 33 days for one recaptured fish specimen, allowing high-resolution archived data to be downloaded. The fish spent most of their time in the mixed layer but undertook dives down to 888 m. Ambient temperatures ranged between 4.6 and 24.1°C, and the sea surface temperatures recorded ranged from 13.4 to 24.1°C during the study period. No clear diel pattern in depth behavior was observed, but mean vertical distribution was deeper during the daytime. Moreover, a foraging pattern, consisting of rapid descents below the thermocline followed by slower ascents, was generally observed during daylight hours. Dissolved oxygen concentration and water temperature seem to be the main factors affecting the vertical range of the species in the area. This is the first study on electronic tagging of the shortfin mako in the southeastern Pacific Ocean and covers the longest total tracking period reported so far for this species.
KeywordsWhite Shark Shark Species Blue Shark Longline Fishery Southern California Bight
The authors wish to thank B. García, O. Soto, D. Espino and the crew of F/V Makus and Mariané for their efforts in the tagging operations, Antonio Medina for his thorough revision of the manuscript, and IAD for their efficiency in the logistics. Collecte Localisation Satellite is acknowledged for their postprocessing of the geolocation data. M. Musyl provided invaluable advice on post-release mortality. The comments from three anonymous reviewers also improved this manuscript considerably. This study was funded by the IEO project SWOATL0710.
Supplementary material 1 (AVI 2839 kb)
Supplementary material 2 (AVI 1947 kb)
- Carey FG, Middleton L, Stillwell C, Pratt W, Kohler NE, Cavin C (1978) Mako shark experiment on “Wiezcno”, March 1978. National Marine Fisheries Service, Northeast Fisheries Center, Woods Hole Laboratory, Laboratory reference no. 78-27Google Scholar
- Carey FG, Teal JM, Kanwisher JW (1981) The visceral temperature of mackerel sharks (Lamnidae). Physiol Zool 54:334–344Google Scholar
- Compagno LJV (2001) Sharks of the world: an annotated and illustrated catalogue of shark species known to date, vol 2: Bullhead, mackerel and carpet sharks (Heterodontiformes, Lamniformes and Orectolobiformes). FAO Species Catalogue for Fishery Purposes, no 1, vol 2, pp 269Google Scholar
- Grusha DS, Patterson (2005) Quantification of drag and lift imposed by pop-up satellite archival tags and estimation of metabolic cost to cownose rays (Rhinoptera bonasus). Fish Bull 103:63–70Google Scholar
- IUCN (2009) IUCN Red list of threatened species. Version 2009. 2. http://www.iucnredlist.org
- Kohler NE, Turner PA, Hoey JJ, Natanson LJ, Briggs R (2002) Tag and recapture data from three pelagic shark species: blue shark (Prionace glauca), shortfin mako (Isurus oxyrinchus), and porbeagle (Lamna nasus) in the north Atlantic Ocean. Col Vol Sci Pap ICCAT 54:1231–1260Google Scholar
- Mejuto J, Iglesias S (1988) Campaña comercial de prospección de abundancia de pez espada, (Xiphias gladius L.) y especies asociadas, en areas próximas a Grand Banks. Col Vol Sci Pap ICCAT 27:155–163Google Scholar
- Mejuto J, García-Cortés B, Ramos-Cartelle A, Ariz J (2007) Preliminary overall estimations of bycatch landed by the Spanish surface longline fleet targeting swordfish (Xihpias gladius) in the Pacific Ocean and interactions with marine turtles and seabirds: year 1990–2005. Inter-American Tropical Tuna Commission Working Group on Bycatch, 6th Meeting, La Jolla, California (USA) 9–10 February 2007Google Scholar
- Schaefer KM, Fuller DW, Block BA (2009) Vertical movements and habitat utilization of skipjack (Katsuwonus pelamis), yellowfin (Thunnus albacares), and bigeye (Thunnus obesus) tunas in the equatorial eastern Pacific Ocean, ascertained through archival tag data. In: Nielsen JL, Arrizabalaga H, Fragoso N, Hobday A, Lutcavage M, Sibert J (eds) Tagging and tracking of marine animals with electronic devices. series: reviews: methods and technologies in fish biology and fisheries, vol 9. Springer, Berlin, Heidelberg, pp 121–144CrossRefGoogle Scholar