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

Robinson, Kendra A., Hinch, Scott G., Gale, Marika K., Clark, Timothy D., Wilson, Samantha M., Donaldson, Michael R., Farrell, Anthony P., Cooke, Steven J. and Patterson, David A. 2013, Effects of post-capture ventilation assistance and elevated water temperature on sockeye salmon in a simulated capture-and-release experiment, Conservation physiology, vol. 1, no. 1, pp. 1-10, doi: 10.1093/conphys/cot015.

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Title Effects of post-capture ventilation assistance and elevated water temperature on sockeye salmon in a simulated capture-and-release experiment
Author(s) Robinson, Kendra A.
Hinch, Scott G.
Gale, Marika K.
Clark, Timothy D.ORCID iD for Clark, Timothy D. orcid.org/0000-0001-8738-3347
Wilson, Samantha M.
Donaldson, Michael R.
Farrell, Anthony P.
Cooke, Steven J.
Patterson, David A.
Journal name Conservation physiology
Volume number 1
Issue number 1
Start page 1
End page 10
Total pages 10
Publisher Oxford University Press
Place of publication Oxford, Eng.
Publication date 2013-01-01
ISSN 2051-1434
Keyword(s) Exhaustive exercise
facilitated recovery
Science & Technology
Life Sciences & Biomedicine
Biodiversity Conservation
Environmental Sciences
Biodiversity & Conservation
Environmental Sciences & Ecology
Summary 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 21°C, average and peak summer water temperatures for the Fraser River, and fish survival was monitored for 33 days. At 21°C, 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 16°C, with fish surviving on average 15-20 days after treatment. At 16°C, 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.
Language eng
DOI 10.1093/conphys/cot015
Field of Research 070499 Fisheries Sciences not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2013, The Author
Persistent URL http://hdl.handle.net/10536/DRO/DU:30105090

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