Comparison of electronarcosis and carbon dioxide sedation effects on travel time in adult Chinook and Coho Salmon

North American Journal of Fisheries Management
By: , and 

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Abstract

The immobilization of fish during handling is crucial in avoiding injury to fish and is thought to reduce handling stress. Chemical sedatives have been a primary choice for fish immobilization. However, most chemical sedatives accumulate in tissues, and often food fishes must be held until accumulations degrade to levels safe for human consumption. Historically, there have been few options for nonchemical sedationCarbon dioxide (CO2) has been widely used for decades as a sedative, and while it does not require a degradation period, it does have drawbacks. The use of electronarcosis is another nonchemical option that does not require degradation time. However, little is known about the latent and delayed effects on migration rates of adult salmonids that have been immobilized with electricity. We compared the travel times of adult Chinook Salmon Oncorhynchus tshawytscha and Coho Salmon O. kisutch through a fishway at river kilometer (rkm) 4, and to rkm 16 and rkm 32 after being immobilized with either COor electronarcosisTravel times of fish treated with either CO2 or electronarcosis were similar within species. Because of the nearly instantaneous induction of and recovery from electronarcosis, we recommend it as an alternative to CO2 for handling large adult salmonids.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Comparison of electronarcosis and carbon dioxide sedation effects on travel time in adult Chinook and Coho Salmon
Series title North American Journal of Fisheries Management
DOI 10.1080/02755947.2015.1069427
Volume 35
Issue 5
Year Published 2015
Language English
Publisher American Fisheries Society
Publisher location Lawrence, KS
Contributing office(s) Western Fisheries Research Center
Description 7 p.
First page 906
Last page 912
Country United States
State Washington
Other Geospatial Klickitat River
Online Only (Y/N) N
Additional Online Files (Y/N) N