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Growth and relative survival of progeny from wild rainbow trout (Oncorhynchus mykiss) strains originating from coarse fish environments have been compared to the standard Pennask trout strain (wild, monoculture) for three years. Mean size of “coarse fish” rainbow trout strains indicate faster growth in length and weight than Pennask trout during the first and second year after release into a lake, in most cases. However, recoveries of the “coarse fish” trout strains relative to the Pennask strain has been variable to date. This comparison may be confounded by differences in mean size at release, differences in stocking density between years, behavioural differences that affect catchability and other unknown factors. Early male maturation does not appear to be a problem for strains compared over three tears. The Blackwater trout strain matures extensively at age 3 and all have matured by age 4. About 50% of the Pennask trout also mature at age 3, but the remainder mature at age 4 or older. Proportion of ra
Tsumura, Kanji, Godin, Theresa I.. 1991. Evaluation of Rainbow Trout Strains in Small Coarse Fish Lakes. Three Year Summary: 1988 to 1990. Ministry of Environment. Fisheries Management Report. FPR28
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