Abstract
Heritability and inbreeding coefficients were estimated for the mortality of uneyed-egg and fry stages. The materials used were offspring, in mutually full sibs, derived from 8 pairs of parents sampled from the Shokanbetsu River and the Mori pond-cultured strain. As analysis of variance the coding method was applied where by 0 and 1 values are assigned to dead and alive individuals respectively. As a result of the analysis, heritability in both uneyed-egg and fry stages were lower than 0.1, showing no efficiency for improving the mortality rates in the early stage of life. The inbreeding coefficients calculated by using genetic variance between the two strains were 0.068 for the uneyed-egg stage and 0.247 for the fry stage, the mean value of the whole stage being 0.127. This seems to suggest that high levels of differentiation occurred between two strains, i.e. the Mori strain and the Shokanbetsu strain.
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