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- Title
Effect of Backpack Electroshock on Westslope Cutthroat Trout Injury and Growth 110 and 250 Days Posttreatment.
- Authors
Dwyer, William P.; Shepard, Bradley B.; White, Robert G.
- Abstract
Westslope cutthroat trout Oncorhynchus clarki lewisi that were reared under captive conditions were exposed to 0.75-1.5 V/cm of continuous, 50-Hz pulsed, or variable pulsed (CPS) direct current (DC) for 5 s to determine whether their growth after 110 and 250 d was affected. Individually marked fish served as experimental units. Only one fish, which was shocked in the CPS treatment, died following treatment. After 110 d, fish that underwent CPS and 50-Hz pulsed-DC electroshock treatments had gained significantly ( P < 0.05) less weight than control fish, but weight gains by fish exposed to continuous DC were not significantly different from those of control fish. After 250 d, fish exposed to any of the three treatments had gained significantly ( P < 0.05) less weight than control fish. At the conclusion of the experiment (250 d), four observers examined the fish to assess whether they had suffered spinal injury. Significantly ( P < 0.05) more fish that had undergone electrofishing treatments exhibited evidence of spinal injury than control fish, but no significant difference was found among observers ( P = 0.841). These results suggest that there are long-term sublethal effects from electroshock on individual westslope cutthroat trout.
- Publication
North American Journal of Fisheries Management, 2001, Vol 21, Issue 3, p646
- ISSN
0275-5947
- Publication type
Article
- DOI
10.1577/1548-8675(2001)021<0646:EOBEOW>2.0.CO;2