Abstract
Abstract Rainbow trout (Oncorhynchus mykiss, formerly Salmo gairdneri) and brown trout (Salmo trutta) were stocked sympatrically in four eutrophic winterkill lakes in 1987 and 1988 and allopatrically in 20 farm dugouts (elsewhere called stock tanks) in 1987. Fish survival and growth were monitored to ascertain the feasibility of using brown trout as an alternative species in prairie aquaculture. In dugouts, survival of both species was similar (about 30%); brown trout had faster daily growth, but both species reached similar and marketable size (about 300 g) by harvest. Brown trout survived better than sympatric rainbow trout in lakes (44 versus 30%), but rainbow trout grew significantly larger than brown trout in four of six cases. Our experiments suggest that brown trout may be a viable alternative to rainbow trout in aquacultural operations.
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