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Effects of post-capture ventilation assistance and elevated water temperature on sockeye salmon in a simulated capture-and-release experiment


Robinson, KA and Hinch, SG and Gale, MK and Clark, TD and Wilson, SM and Donaldson, MR and Farrell, AP and Cooke, SJ and Patterson, DA, Effects of post-capture ventilation assistance and elevated water temperature on sockeye salmon in a simulated capture-and-release experiment, Conservation Physiology, 1, (1) Article cot015. ISSN 2051-1434 (2013) [Refereed Article]


Copyright Statement

Copyright 2013 The Author Licenced under the terms of the Creative Commons Attribution License

DOI: doi:10.1093/conphys/cot015


The live release of wild adult Pacific salmon (Oncorhynchus spp.) following capture is a management tactic often used in commercial, aboriginal, and recreational fisheries. Fisheries capture and handling can be both exhausting and stressful to fish, which can limit their ability to swim and survive after release. As a result, researchers have assessed methods intended to improve post-release survival by assisting the flow of water over the gills of fish prior to release. Such approaches use recovery bags or boxes that direct water over the gills of restrained fish. This study evaluated a method of assisting ventilation that mimics one often employed by recreational anglers (i.e. holding fish facing into a current). Under laboratory conditions, wild Fraser River sockeye salmon (Oncorhynchus nerka) either received manual ventilation assistance for 1 min using a jet of water focused at the mouth or were left to recover unassisted following a capture-and-release simulation. A control group consisted of fish that were not exposed to the simulation or ventilation assistance. The experiment was conducted at 16 and 21C, average and peak summer water temperatures for the Fraser River, and fish survival was monitored for 33 days. At 21C, all fish perished within 3 days after treatment in all experimental groups, highlighting the consequences of handling adult sockeye salmon during elevated migration temperatures. Survival was higher at 16C, with fish surviving on average 1520 days after treatment. At 16C, the capture-and-release simulation and ventilation assistance did not affect the survival of males; however, female survival was poor after the ventilation assistance compared with the unassisted and control groups. Our results suggest that the method of ventilation assistance tested in this study may not enhance the post-release survival of adult Fraser River sockeye salmon migrating in fresh water.

Item Details

Item Type:Refereed Article
Keywords:exhaustive exercise, facilitated recovery, fisheries revival, stress, survival
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:103368
Year Published:2013
Web of Science® Times Cited:28
Deposited By:IMAS Research and Education Centre
Deposited On:2015-10-07
Last Modified:2017-10-31
Downloads:310 View Download Statistics

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