The physiological response of the Caribbean reef shark (Carcharhinus perezi) to longline capture

Brooks, Edward J.; Mandelman, John W.; Sloman, Katherine A.; Liss, Stephanie A.; Danylchuk, Andy J.; Cooke, Steven J.; Skomal, Gregory B.; Philipp, David P.; Sims, David; Suski, Cory D.

doi:10.1016/j.cbpa.2011.04.012

Cited by 69 publications

(73 citation statements)

References 33 publications

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“…Captured sharks can experience significant changes in plasma chloride concentration, plasma glucose concentration, plasma calcium concentration, and hematocrit percentage (Cliff and Thurman, 1984;McDonald and Milligan, 1992;Heberer et al, 2010). However, these measurements are unaffected by capture duration in some species (Brooks et al, 2012;Kneebone et al, 2013;Butcher et al, 2015). In the present study, we observed no significant effect of capture duration on C. brachyurus plasma chloride concentration, plasma calcium concentration, plasma glucose concentration, and hematocrit percentage.…”

Section: Discussioncontrasting

confidence: 43%

“…Plasma lactate and potassium concentrations in C. brachyurus had a positive linear relationship with capture duration. Some species capable of stationary respiration (e.g., Mustelus antarticus, Heterodontus portusjacksoni, and Carcharhinus perezi) exhibit a physiological response characterized by plasma lactate concentration peaking at 0-6 h after longline capture (Frick et al, 2010;Brooks et al, 2012). Following this peak, plasma lactate concentration decreases as physiological recovery begins while captured on fishing gear (Frick et al, 2010;Brooks et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

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Moving from Measuring to Predicting Bycatch Mortality: Predicting the Capture Condition of a Longline-Caught Pelagic Shark

et al. 2016

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Incidental fisheries capture has been identified as having a major effect on shark populations throughout the world. However, factors that contribute to the mortality of shark bycatch during fisheries capture are not fully understood. Here, we investigated the effects of capture duration, sea surface temperature, and shark total length (snout to the tip of the upper caudal lobe) on the physiology and condition of longline-caught bronze whalers, Carcharhinus brachyurus. Plasma lactate and potassium concentration had a positive linear relationship with capture duration, indicating that this species experiences increasing physiological challenges while on fishing gear. Additionally, we used stereotype logistic regression models to determine variables that could predict the capture condition of sharks (categorized as "healthy," "sluggish," or "moribund or dead"). In these models, elevated plasma lactate concentration, plasma potassium concentration, and capture duration increased the likelihood of C. brachyurus being captured in a "sluggish" condition or in a "moribund or dead" condition. After plasma lactate concentration exceeded 27.4 mmol/L, plasma potassium concentration exceeded 8.3 mmol/L, or capture durations exceeded 293 min, the majority of captured sharks (>50%) were predicted to be "moribund or dead." We recommend that a reduction in the amount of time longlines are left fishing (soak time) will reduce immediate and post-release mortality in C. brachyurus bycatch and that our methods could be applied to identify causes of fisheries-induced mortality in future studies. The identification of operational, environmental, and biological variables contributing to poor condition will be necessary to implement conservation strategies that reduce mortality during capture.

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Section: Discussioncontrasting

confidence: 43%

Section: Discussionmentioning

confidence: 99%

Moving from Measuring to Predicting Bycatch Mortality: Predicting the Capture Condition of a Longline-Caught Pelagic Shark

et al. 2016

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“…Historically, across the Bahamas great hammerheads have been rarely encountered. Only two individuals were captured on shallow-water longlines set bi-monthly in Bimini from 2003 to 2008 (Kessel, 2010), and three across four seasons in Eleuthera (Brooks et al, 2012). Interestingly, a handful of observations have documented great hammerhead sharks' use of extreme shallow water (< 2 m) habitats in Andros Island and Eleuthera (Roemer et al, 2016), as well as two predation events in Bimini on a southern stingray (Dasyatis americana) and spotted eagle ray (Aetobatus narinari) (Strong et al, 1990;Chapman and Gruber, 2002).…”

Section: Introductionmentioning

confidence: 99%

Philopatry and Regional Connectivity of the Great Hammerhead Shark, Sphyrna mokarran in the U.S. and Bahamas

et al. 2017

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A thorough understanding of movement patterns of a species is critical for designing effective conservation and management initiatives. However, generating such information for large marine vertebrates is challenging, as they typically move over long distances, live in concealing environments, are logistically difficult to capture and, as uppertrophic predators, are naturally low in abundance. Large-bodied, broadly distributed tropical shark typically restricted to coastal and shelf habitats, the great hammerhead shark Sphyrna mokarran epitomizes such challenges. Highly valued for its fins (in target and incidental fisheries), it suffers high bycatch mortality coupled with fecundity conservative life history, and as a result, is vulnerable to over-exploitation and population depletion. Although there are very little species-specific data available, the absence of recent catch records give cause to suspect substantial declines across its range. Here, we used biotelemetry techniques (acoustic and satellite), conventional tagging, laser-photogrammetry, and photo-identification to investigate the level of site fidelity/residency for great hammerheads to coastal areas in the Bahamas and U.S., and the extent of movements and connectivity of great hammerheads between the U.S. and Bahamas. Results revealed large-scale return migrations (3030 km), seasonal residency to local areas (some for 5 months), site fidelity (annual return to Bimini and Jupiter for many individuals) and numerous international movements. These findings enhance the understanding of movement ecology in great hammerhead sharks and have potential to contribute to improved conservation and management.

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“…Longlines may be set between three and eight hours (Weng and Block 2004;Barnett et al 2010;Brooks et al 2012) and drumlines around one hour (Hammerschlag et al 2012). This is considerably longer than the technique described here (between 60 s and ten minutes depending on sampling method).…”

Section: Discussionmentioning

confidence: 99%

“…Longline and drumline capture are the most frequent methods used. However, although both techniques are potentially less stressful than some other capture methods, they may still result in captured animals struggling dramatically and thrashing violently (Brooks et al 2012), which can lead to potentially lethal physiological consequences (Hoffmayer and Parsons 2001;Manire et al 2001;Skomal 2007;Mandelman and Skomal 2008). As such, there is a need for the exploration of other non-lethal methods of capture of shark species, which cause less impact to the stress and welfare of captured animals (Barnett et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Tonic immobility in the zebra shark, Stegostoma fasciatum, and its use for capture methodology

Williamson

Dudgeon

Slade³

2018

Environ Biol Fish

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When conducting biological investigations on shark species, capture and brief restraint procedures may be required in order to collect ecological, behavioral and physiological data. Tonic immobility is an innate, reversible, coma-like stasis displayed by a large number of taxa, including sharks, and has been used for brief restraint, but is rarely used during capture itself. Here, we present a novel, non-lethal capture method of zebra sharks, Stegostoma fasciatum, using tonic immobility, in the field. Zebra sharks were caught by free diving, and on SCUBA, inducing a state of tonic immobility by quickly applying tight-fisted manual pressure to the caudal fin, instead of the dorso-ventral inversion method. Divers were then able to collect tissue samples for genetic analysis, and in some cases, maintain the animals in a state of tonic immobility during transport up to the research vessel for additional data collection. Decreased duration of anthropogenic intervention, and minimal physical struggle associated with this capture and restraint method is expected to reduce physiological markers of distress. Tonic immobility induction and other methods of nonlethal capture deserve continued investigation.

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The physiological response of the Caribbean reef shark (Carcharhinus perezi) to longline capture

Cited by 69 publications

References 33 publications

Moving from Measuring to Predicting Bycatch Mortality: Predicting the Capture Condition of a Longline-Caught Pelagic Shark

Moving from Measuring to Predicting Bycatch Mortality: Predicting the Capture Condition of a Longline-Caught Pelagic Shark

Philopatry and Regional Connectivity of the Great Hammerhead Shark, Sphyrna mokarran in the U.S. and Bahamas

Tonic immobility in the zebra shark, Stegostoma fasciatum, and its use for capture methodology

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