Temperature Insensitivity and Behavioural Reduction of the Physiological Stress Response to Longline Capture by the Gummy Shark, Mustelus antarcticus

Guida, Leonardo; Walker, Terence I.; Reina, Richard D.

doi:10.1371/journal.pone.0148829

Cited by 29 publications

(28 citation statements)

References 34 publications

(61 reference statements)

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“…While behavior was not directly recorded in the present study, sawfish are known to rest on the substrate and live a more sedentary lifestyle. During this study, P. pectinata were observed to rest on the substrate after capture, similar to H. portusjacksoni during simulated capture (Frick et al 2010a), and as inferred from temperature depth recorder behavior data in longline captured M. antarcticus (Guida et al 2016). This behavior could contribute to lower glucose concentrations, as ob served in teleosts (Vijayan & Moon 1994, Waring et al 1996, by either stopping glucose levels from rising higher or allowing time for clearance.…”

Section: Discussionsupporting

confidence: 55%

Physiological stress in the smalltooth sawfish: effects of ontogeny, capture method, and habitat quality

Prohaska¹,

Bethea²,

Poulakis³

et al. 2018

Endang. Species. Res.

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Similar to other elasmobranchs, the smalltooth sawfish Pristis pectinata is slow growing, matures late in life, and produces relatively few young, all factors that have contributed to its sensitivity to dramatic population declines from overfishing and habitat loss. Currently, the physiological stress response of these fish to capture or to other physiological challenges such as habitat loss, climatic changes, or pollution is unknown. In the absence of these data, conservation plans may be less effective, making populations susceptible to further declines. We examined basic stress physiology over ontogeny and as a function of capture using different fishing gears. We also examined stress parameters to test whether degraded habitat and water quality from altered habitats may have resulted in chronic stress in juveniles. Results suggested that the stress response to capture by all methods was low, particularly for blood lactate, compared to other elasmobranchs examined to date. Metabolic stress was found to change over ontogeny, with young of the year (YOY) eliciting the highest responses. Glucose, pCO 2 , bicarbonate, potassium, and hematocrit indicated that gillnet capture induced greater stress responses than longline capture. Significantly higher metabolic stress was observed in YOY and juveniles captured in the 2 nurseries most influenced by anthropogenic activities, the Peace and Caloosahatchee rivers, than in the 2 relatively pristine nurseries in Everglades National Park. Overall, the low physiological stress responses to all capture methods investigated in this study suggest that this species is resilient, which should promote optimism for recovery of the population.

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Section: Discussionsupporting

confidence: 55%

Physiological stress in the smalltooth sawfish: effects of ontogeny, capture method, and habitat quality

Prohaska¹,

Bethea²,

Poulakis³

et al. 2018

Endang. Species. Res.

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show abstract

“…For all sharks for which we were able to pair physiological data with behavioural data (plasma lactate and accelerometer, n = 14), we found a D r a f t positive and significant relationship between maximum acceleration and plasma lactate ( Figure 2). This is an important finding as it suggests that bouts of intense fighting and high rates of movement, as represented in maximum acceleration herein, are likely to result in physiological stress (Butcher et al 2015, Guida et al 2016. However, this relationship was not affected by time on the line, which corroborates the notion that species-specific differences in capture responses may be more likely to drive physiological disruption and survival outcomes than fight time alone, particularly for hard-fighting species (Gallagher et al 2014a.b).…”

Section: Discussionmentioning

confidence: 76%

“…In summary, these findings suggest that animal movement during capture may underpin a pivotal mechanism both triggering and maintaining the physiological stress response of sharks when captured in fisheries interactions (Guida et al 2016). Obtaining physiological data from large and highly mobile apex predators is inherently challenging, and our study highlights the utility in applying bio-logging devices in novel and innovative ways to understand the relationship between animal performance and resilience to human stressors (Whitney et al 2016b).…”

Section: Discussionmentioning

confidence: 86%

Behavioural responses to fisheries capture among sharks caught using experimental fishery gear

Gallagher

Staaterman

Cooke

et al. 2017

Can. J. Fish. Aquat. Sci.

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The response to capture is important in fisheries because it can reveal potential threats to species beyond fishing mortalities resulting from direct harvest. To date, the vast majority of studies assessing shark stress responses have used physiology or biotelemetry to look at sensitivity after capture, leaving a gap in our understanding of the behaviours of sharks during capture. We examined the behavioural responses of sharks to capture by attaching accelerometers to fishing gear and measuring the immediate and prolonged forces they exerted while on the line. We recorded acceleration vectors and derived the rate of intense fighting behaviours of 23 individual sharks comprising three species. Results suggest that blacktip sharks (Carcharhinus limbatus) exhibited intense bouts of fighting behaviour at the onset of hooking, while nurse (Ginglymostoma cirratum) and tiger sharks (Galeocerdo cuvier) displayed more subdued acceleration values during capture. We also obtained plasma lactate from a subset of individuals and detected a strong correlation with maximum acceleration. These results align with previously published values and suggest that shark movement during fisheries capture is an important factor during bycatch and catch-and-release interactions.

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“…Discard mortality of elasmobranchs caught in fishing gears varies with a range of factors (Stobutzki et al, 2002;Broadhurst et al, 2006;Morgan & Carlson, 2010;Dapp et al, 2016b;Guida et al, 2016b) and these include gear type (i.e. the gear and its configuration), fishing practices (e.g.…”

Section: Discard Mortality Of Elasmobranchs By Gearmentioning

confidence: 99%

A review of capture and post‐release mortality of elasmobranchs

Ellis

Phillips

Poisson

2016

Journal of Fish Biology

127

108

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There is a need to better understand the survivorship of discarded fishes, both for commercial stocks and species of conservation concern. Within European waters, the landing obligations that are currently being phased in as part of the European Union's reformed common fisheries policy means that an increasing number of fish stocks, with certain exceptions, should not be discarded unless it can be demonstrated that there is a high probability of survival. This study reviews the various approaches that have been used to examine the discard survival of elasmobranchs, both in terms of at-vessel mortality (AVM) and post-release mortality (PRM), with relevant findings summarized for both the main types of fishing gear used and by taxonomic group. Discard survival varies with a range of biological attributes (species, size, sex and mode of gill ventilation) as well as the range of factors associated with capture (e.g. gear type, soak time, catch mass and composition, handling practices and the degree of exposure to air and any associated change in ambient temperature). In general, demersal species with buccal-pump ventilation have a higher survival than obligate ram ventilators. Several studies have indicated that females may have a higher survival than males. Certain taxa (including hammerhead sharks Sphyrna spp. and thresher sharks Alopias spp.) may be particularly prone to higher rates of mortality when caught.

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Temperature Insensitivity and Behavioural Reduction of the Physiological Stress Response to Longline Capture by the Gummy Shark, Mustelus antarcticus

Cited by 29 publications

References 34 publications

Physiological stress in the smalltooth sawfish: effects of ontogeny, capture method, and habitat quality

Physiological stress in the smalltooth sawfish: effects of ontogeny, capture method, and habitat quality

Behavioural responses to fisheries capture among sharks caught using experimental fishery gear

A review of capture and post‐release mortality of elasmobranchs

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