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- Title
MANAGEMENT BRIEFS: Effect of Electroshock on Juvenile Arctic Grayling and Yellowstone Cutthroat Trout Growth, 100 Days after Treatment.
- Authors
DWYER, WILLIAM P.; WHITE, ROBERT G.
- Abstract
Juvenile Arctic grayling Thymallus arcticus and Yellowstone cutthroat trout Oncorhynchus clarki bouvieri, reared under captive conditions, were exposed to 0.75 or 1.5 V/cm of smooth or 60-Hz pulsed DC for 5 or 10 s (eight treatments) to determine any effects on growth after 100 d. Individually marked fish served as the experimental units. Growth of Arctic grayling was affected by some electroshock treatments; length and weight of fish exposed to pulsed DC was significantly reduced. Arctic grayling in affected treatments gained 9.2-16.5 mm and 17.1-25.7 g less than the corresponding control fish. The 60-Hz pulsed DC reduced growth of Arctic grayling more than smooth DC at the same duration and voltage level. Reduction of Yellowstone cutthroat trout growth was less significant among treatments than reduction of Arctic grayling growth. Sample size of cutthroat trout was smaller, however, at the termination of the study due to tag loss and fish loss. Although only five of the Yellowstone cutthroat trout treatments were statistically significant, there was less increase in length and weight in seven of the eight treatments compared with the controls. This trend suggests that there may be some long-term sublethal effects for the two species tested.
- Publication
North American Journal of Fisheries Management, 1997, Vol 17, Issue 1, p174
- ISSN
0275-5947
- Publication type
Article
- DOI
10.1577/1548-8675(1997)017<0174:MBEOEO>2.3.CO;2