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Experimental hexamitiasis in juvenile coho salmon (Oncorhynchus kisutch) and steelhead trout (Salmo gairdner)

September 17, 2015

An exogenous strain of cultured Hexamita salmonis (Moore) was employed to induce trophic hexamitiasis in otherwise disease-free juveniles of coho salmon (Oncorhynchus kisutch) and steelhead trout (Salmo gairdneri). Mortality and growth were the parameters used to detect the effects of hexamitiasis on the two species. Two levels of each of the three experimental factors under study, Hexamita infection, species of fish, and density of fish, were arranged in a three-way factorial design. Replicate lots involved a total of 1,440 fish held under controlled laboratory conditions.

Comparisons of growth and mortality indicate that infection with H. salmonis over a period of 8 weeks is innocuous to coho salmon. Steelhead trout suffered a low, but statistically significant mortality which subsided after the sixth week; growth rate was not affected.

Citation Information

Publication Year 1965
Title Experimental hexamitiasis in juvenile coho salmon (<i>Oncorhynchus kisutch</i>) and steelhead trout (<i>Salmo gairdner</i>)
DOI 10.1577/1548-8659(1965)94[53:EHIJCS]2.0.CO;2
Publication Type Article
Publication Subtype Journal Article
Series Title Transactions of the American Fisheries Society
Series Number
Index ID 70161801
Record Source USGS Publications Warehouse
USGS Organization Western Fisheries Research Center