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Open Access Publications from the University of California

Quantitative Genetics of Body Size and Reproduction in Rainbow Trout (Oncorhynchus mykiss)


Body size and developmental characters of 13 traits were measured with samples taken every two mo starting at 4 mo of age and continuing through their first complete reproduction cycle. The overall total sample size was 2570 progeny from 102 families sired by 46 males of two broodstocks. Three different diets, a standard commercial formulation and two with different crude protein and digestible energy levels, were fed to subgroups of fish of each stock from 12 to 24 mo of age. The standard commercial diet was fed to all fish during the first year.

Significant stock, sire and dam effects were observed for body weight, carcass weight, fork length, liver weight, gonad weight, oocyte diameter, condition factor, gonadosomatic index, and hepatosomatic index (P

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