High survivorship after catch-and-release fishing suggests physiological resilience in the endothermic shortfin mako shark (<i>Isurus oxyrinchus</i>)

French, Robert P.; Lyle, JM; Tracey, S; Currie, Suzanne; Semmens, Jayson M.

doi:10.1093/conphys/cov044

Cited by 47 publications

(36 citation statements)

References 87 publications

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“…Maturity in males was assessed following [13]. Great hammerheads that were deemed to be in good condition (i.e., active and responsive, little or no visible external damage, [14]) were fitted with three tags: a conventional dart tag (Floy) and two satellite tags. Smart position and temperature transmitting tags (SPOT6, Wildlife Computers) were attached to the dorsal fin.…”

Section: Methodsmentioning

confidence: 99%

Double tagging clarifies post-release fate of great hammerheads (Sphyrna mokarran)

Drymon

Wells

2017

Anim Biotelemetry

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Background: Biotelemetry applications have advanced our understanding of many highly migratory species, but present a challenge for species that suffer high capture and/or post-release stress. Failing to accurately characterize post-release fate can obfuscate our understanding of animal movement patterns and complicate the development of effective conservation and management plans. The great hammerhead (Sphyrna mokarran) is a long-lived, highly migratory shark listed by the International Union for the Conservation of Nature as Endangered. Accordingly, we used a combination of tags designed to report horizontal position estimates and verify post-release fate, to examine movements of great hammerheads in the northern Gulf of Mexico.Results: Between May and September 2016, three individuals (one male and two females) were equipped with both fin-mounted smart position and temperature transmitting (SPOT) tags and survivorship pop-off archival tags (sPAT) to provide information on post-release fate. Tagged sharks measured 187 (F), 203 (M), and 250 (M) cm total length. All three sharks surfaced daily, yet individuals showed variability in vertical habitat use, with maximum daily depths ranging from 5 to 98 m. A single fin-mounted SPOT tag, attached to the smallest of the three sharks, reported position estimates over an 81-day period and moved a straight-line distance of approximately 400 km; however, the other two fin-mounted SPOT tags failed to generate position estimates. All three sPAT tags indicated post-release survival. Final positions of the sPAT tags from the two largest sharks suggested restricted horizontal movements (< 35 km). Conclusions:Despite their demonstrated utility on other shark species that frequent the surface, fin-mounted SPOT tags may not be the best option for tracking great hammerheads. In addition, our findings illustrate the value of double-tagging animals under certain conditions; notably, over the short monitoring period of this study, one of the three sharks tagged may have been incorrectly presumed dead had only a fin-mounted SPOT tag been used.

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Section: Methodsmentioning

confidence: 99%

Double tagging clarifies post-release fate of great hammerheads (Sphyrna mokarran)

Drymon

Wells

2017

Anim Biotelemetry

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“…Recent research involving coastal and pelagic sharks (primarily Carcharhinid species) has also evaluated that the survival of sharks in response to capture have also found high variability in survival rates (see reviews by Skomal and Bernal 2010;Skomal and Mandelman 2012), but the vast majority of this work has involved commercial fishing interactions and not recreational angling (Molina and Cooke 2012;Gallagher et al 2015). The growing realization that sharks could be negatively affected by CR fisheries interactions has spawned a handful of studies focusing on recreational angling (e.g., Campana et al 2006;Robbins et al 2013;Danylchuk et al 2014;French et al 2015), including some human dimensions work (Babcock 2009;Gallagher et al 2015;McClellan Press et al 2015), but many significant gaps in knowledge and research remain. Mortalities from recreational fishing are a form of fishing mortality, and thus they are important for stock assessments and fisheries management plans, although this information is not always available [i.e., the Southeast Data Assessment and Review; SEDAR (e.g., Atlantic sharpnose shark, blacktip shark, bonnethead shark) NOAA Fisheries 2006; Shiffman and Hammerschlag 2016a].…”

Section: Introductionmentioning

confidence: 99%

Shark recreational fisheries: Status, challenges, and research needs

Gallagher

Hammerschlag

Danylchuk

et al. 2016

Ambio

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For centuries, the primary manner in which humans have interacted with sharks has been fishing. A combination of their slow-growing nature and high usevalues have resulted in population declines for many species around the world, and to date the vast majority of fisheriesrelated work on sharks has focused on the commercial sector. Shark recreational fishing remains an overlooked area of research despite the fact that these practices are popular globally and could present challenges to their populations. Here we provide a topical overview of shark recreational fisheries, highlighting their history and current status. While recreational fishing can provide conservation benefits under certain circumstances, we focus our discourse on the relatively understudied, potentially detrimental impacts these activities may have on shark physiology, behavior, and fitness. We took this angle given the realized but potentially underestimated significance of recreational fishing for shark conservation management plans and stock assessments, in hopes of creating a dialogue around sustainability. We also present a series of broad and focused research questions and underpin areas of future research need to assist with the development of this emergent area of research.

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“…Such point-of-care field devices have been used in elasmobranchs (e.g. Awruch et al, 2011;French et al, 2015) and have been validated for lactate in school (Awruch et al, 2011) and shortfin mako shark (French et al, 2015). However, these instruments are not precise and we used values for relative comparisons; absolute values should be interpreted with caution (see Stoot et al, 2014).…”

Section: Blood Parameters and Plasma Ionsmentioning

confidence: 99%

Physiological responses to hypersalinity correspond to nursery ground usage in two inshore shark species (Mustelus antarcticus & Galeorhinus galeus)

Tunnah

Mackellar

Barnett

et al. 2016

Journal of Experimental Biology

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Shark nurseries are susceptible to environmental fluctuations in salinity because of their shallow, coastal nature; however, the physiological impacts on resident elasmobranchs are largely unknown. Gummy sharks (Mustelus antarcticus) and school sharks (Galeorhinus galeus) use the same Tasmanian estuary as a nursery ground; however, each species has distinct distribution patterns that are coincident with changes in local environmental conditions, such as increases in salinity. We hypothesized that these differences were directly related to differential physiological tolerances to high salinity. To test this hypothesis, we exposed wild, juvenile school and gummy sharks to an environmentally relevant hypersaline (120% SW) event for 48 h. Metabolic rate decreased 20-35% in both species, and gill Na + /K + -ATPase activity was maintained in gummy sharks but decreased 37% in school sharks. We measured plasma ions (Na + , K + , Cl − ) and osmolytes [urea and trimethylamine oxide (TMAO)], and observed a 33% increase in plasma Na + in gummy sharks with hyperosmotic exposure, while school sharks displayed a typical ureosmotic increase in plasma urea (∼20%). With elevated salinity, gill TMAO concentration increased by 42% in school sharks and by 30% in gummy sharks. Indicators of cellular stress (heat shock proteins HSP70, 90 and 110, and ubiquitin) significantly increased in gill and white muscle in both a species-and a tissue-specific manner. Overall, gummy sharks exhibited greater osmotic perturbation and ionic dysregulation and a larger cellular stress response compared with school sharks. Our findings provide physiological correlates to the observed distribution and movement of these shark species in their critical nursery grounds.

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High survivorship after catch-and-release fishing suggests physiological resilience in the endothermic shortfin mako shark (Isurus oxyrinchus)

Cited by 47 publications

References 87 publications

Double tagging clarifies post-release fate of great hammerheads (Sphyrna mokarran)

Double tagging clarifies post-release fate of great hammerheads (Sphyrna mokarran)

Shark recreational fisheries: Status, challenges, and research needs

Physiological responses to hypersalinity correspond to nursery ground usage in two inshore shark species (Mustelus antarcticus & Galeorhinus galeus)

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