Exercise intensity while hooked is associated with physiological status of longline-captured sharks

Bouyoucos, Ian A., Talwar, Brendan S., Brooks, Edward J., Brownscombe, Jacob W., Cooke, Steven J., Suski, Cory D., and Mandelman, John W. (2018) Exercise intensity while hooked is associated with physiological status of longline-captured sharks. Conservation Physiology, 6 (1). coy074.

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Abstract

Some shark populations face declines owing to targeted capture and by-catch in longline fisheries. Exercise intensity during longline capture and physiological status may be associated, which could inform management strategies aimed at reducing the impacts of longline capture on sharks. The purpose of this study was to characterize relationships between exercise inten- sity and physiological status of longline-captured nurse sharks (Ginglymostoma cirratum) and Caribbean reef sharks (Carcharhinus perezi). Exercise intensity of longline-captured sharks was quantified with digital cameras and accelerometers, which was paired with blood-based physiological metrics from samples obtained immediately post-capture. Exercise intensity was associated with physiological status following longline capture. For nurse sharks, blood pH increased with capture dur- ation and the proportion of time exhibiting low-intensity exercise. Nurse sharks also had higher blood glucose and plasma potassium concentrations at higher sea surface temperatures. Associations between exercise intensity and physiological sta- tus for Caribbean reef sharks were equivocal; capture duration had a positive relation with blood lactate concentrations and a negative relationship with plasma chloride concentrations. Because Caribbean reef sharks did not appear able to influence blood pH through exercise intensity, this species was considered more vulnerable to physiological impairment. While both species appear quite resilient to longline capture, it remains to be determined if exercise intensity during capture is a useful tool for predicting mortality or tertiary sub-lethal consequences. Fisheries management should consider exercise during cap- ture for sharks when developing techniques to avoid by-catch or reduce physiological stress associated with capture.

Item ID: 60597
Item Type: Article (Research - C1)
ISSN: 2051-1434
Copyright Information: © The Author(s) 2018. Published by Oxford University Press and the Society for Experimental Biology. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited
Funders: Cape Eleuthera Foundation, Australian Government Research Training Program, National Sciences and Engineering Research Council (NSERC), Canada Research Chairs Program
Date Deposited: 14 Oct 2019 01:54
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070403 Fisheries Management @ 30%
06 BIOLOGICAL SCIENCES > 0608 Zoology > 060801 Animal Behaviour @ 30%
06 BIOLOGICAL SCIENCES > 0606 Physiology > 060604 Comparative Physiology @ 40%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830299 Fisheries- Wild Caught not elsewhere classified @ 100%
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