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A physiological comparison of three techniques for reviving sockeye salmon exposed to a severe capture stressor during upriver migration


Raby, GD and Wilson, SM and Patterson, DA and Hinch, SG and Clark, TD and Farrell, AP and Cooke, SJ, A physiological comparison of three techniques for reviving sockeye salmon exposed to a severe capture stressor during upriver migration, Conservation Physiology, 3, (1) Article cov015. ISSN 2051-1434 (2015) [Refereed Article]


Copyright Statement

Copyright 2015 The Author. Published by Oxford University Press and the Society for Experimental Biology. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.1093/conphys/cov015


Capture of fish in commercial and recreational fisheries causes disruption to their physiological homeostasis and can result in delayed mortality for fish that are released. For fish that are severely impaired, it may be desirable to attempt revival prior to release to reduce the likelihood of post-release mortality. In this study, male sockeye salmon (Oncorhynchus nerka) undergoing their upriver migration were used to examine short-term physiological changes during the following three revival treatments after beach seine capture and air exposure: a pump-powered recovery box that provided ram ventilation at one of two water flow rates; and a cylindrical, in-river recovery bag, which ensured that fish were oriented into the river flow. Beach seine capture followed by a 3 min air exposure resulted in severe impairment of reflexes such that fish could not maintain positive orientation or properly ventilate. All three revival treatments resulted in significant reductions in reflex impairment within 15 min, with full recovery of reflex responses observed within 60120 min. For most variables measured, including plasma lactate, cortisol and osmolality, there were no significant differences among revival treatments. There was some evidence for impaired recovery in the low-flow recovery box, in the form of higher haematocrit and plasma sodium. These data mirror published recovery profiles for a recovery box study in the marine environment where a survival benefit occurred, suggesting that the methods tested here are viable options for reviving salmon caught in freshwater. Importantly, with most of the benefit to animal vitality accrued in the first 15 min, prolonging recovery when fish become vigorous may not provide added benefit because the confinement itself is likely to serve as a stressor.

Item Details

Item Type:Refereed Article
Keywords:bycatch, catch and release, discards, exhaustive exercise, post-release mortality, stress response
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal behaviour
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Coastal or estuarine biodiversity
UTAS Author:Clark, TD (Dr Timothy Clark)
ID Code:103262
Year Published:2015
Web of Science® Times Cited:7
Deposited By:IMAS Research and Education Centre
Deposited On:2015-09-30
Last Modified:2017-10-31
Downloads:629 View Download Statistics

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