Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery.

Bycatch mortality is a major factor contributing to shark population declines. Post-release mortality (PRM) is particularly difficult to quantify, limiting the accuracy of stock assessments. We paired blood-stress physiology with animal-borne accelerometers to quantify PRM rates of sharks caught in...

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Autores principales:	Nicholas M Whitney, Karissa O Lear, John J Morris, Robert E Hueter, John K Carlson, Heather M Marshall
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/57b45535101746c3b2bc018a52f4e0e4
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id	oai:doaj.org-article:57b45535101746c3b2bc018a52f4e0e4
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spelling	oai:doaj.org-article:57b45535101746c3b2bc018a52f4e0e42021-12-02T20:08:15ZConnecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery.1932-620310.1371/journal.pone.0255673https://doaj.org/article/57b45535101746c3b2bc018a52f4e0e42021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0255673https://doaj.org/toc/1932-6203Bycatch mortality is a major factor contributing to shark population declines. Post-release mortality (PRM) is particularly difficult to quantify, limiting the accuracy of stock assessments. We paired blood-stress physiology with animal-borne accelerometers to quantify PRM rates of sharks caught in a commercial bottom longline fishery. Blood was sampled from the same individuals that were tagged, providing direct correlation between stress physiology and animal fate for sandbar (Carcharhinus plumbeus, N = 130), blacktip (C. limbatus, N = 105), tiger (Galeocerdo cuvier, N = 52), spinner (C. brevipinna, N = 14), and bull sharks (C. leucas, N = 14). PRM rates ranged from 2% and 3% PRM in tiger and sandbar sharks to 42% and 71% PRM in blacktip and spinner sharks, respectively. Decision trees based on blood values predicted mortality with >67% accuracy in blacktip and spinner sharks, and >99% accuracy in sandbar sharks. Ninety percent of PRM occurred within 5 h after release and 59% within 2 h. Blood physiology indicated that PRM was primarily associated with acidosis and increases in plasma potassium levels. Total fishing mortality reached 62% for blacktip and 89% for spinner sharks, which may be under-estimates given that some soak times were shortened to focus on PRM. Our findings suggest that no-take regulations may be beneficial for sandbar, tiger, and bull sharks, but less effective for more susceptible species such as blacktip and spinner sharks.Nicholas M WhitneyKarissa O LearJohn J MorrisRobert E HueterJohn K CarlsonHeather M MarshallPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 9, p e0255673 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Nicholas M Whitney Karissa O Lear John J Morris Robert E Hueter John K Carlson Heather M Marshall Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery.
description	Bycatch mortality is a major factor contributing to shark population declines. Post-release mortality (PRM) is particularly difficult to quantify, limiting the accuracy of stock assessments. We paired blood-stress physiology with animal-borne accelerometers to quantify PRM rates of sharks caught in a commercial bottom longline fishery. Blood was sampled from the same individuals that were tagged, providing direct correlation between stress physiology and animal fate for sandbar (Carcharhinus plumbeus, N = 130), blacktip (C. limbatus, N = 105), tiger (Galeocerdo cuvier, N = 52), spinner (C. brevipinna, N = 14), and bull sharks (C. leucas, N = 14). PRM rates ranged from 2% and 3% PRM in tiger and sandbar sharks to 42% and 71% PRM in blacktip and spinner sharks, respectively. Decision trees based on blood values predicted mortality with >67% accuracy in blacktip and spinner sharks, and >99% accuracy in sandbar sharks. Ninety percent of PRM occurred within 5 h after release and 59% within 2 h. Blood physiology indicated that PRM was primarily associated with acidosis and increases in plasma potassium levels. Total fishing mortality reached 62% for blacktip and 89% for spinner sharks, which may be under-estimates given that some soak times were shortened to focus on PRM. Our findings suggest that no-take regulations may be beneficial for sandbar, tiger, and bull sharks, but less effective for more susceptible species such as blacktip and spinner sharks.
format	article
author	Nicholas M Whitney Karissa O Lear John J Morris Robert E Hueter John K Carlson Heather M Marshall
author_facet	Nicholas M Whitney Karissa O Lear John J Morris Robert E Hueter John K Carlson Heather M Marshall
author_sort	Nicholas M Whitney
title	Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery.
title_short	Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery.
title_full	Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery.
title_fullStr	Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery.
title_full_unstemmed	Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery.
title_sort	connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/57b45535101746c3b2bc018a52f4e0e4
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Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery.

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