生殖形質に見られた湖産および海産アユ間の遺伝的差異

概要

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The reproductive characters such as hatching time, egg diameter and total length of hatched larvae were observed to find genetic differences between two local races of ayu, Plecoglossus altivelis altivelis. The two forms were reared consistently in the same tank and under the same environmental conditions from the young to adult stages in order to standardize environmental effects in the inter- and intra-racial cross breeding tests. Significant differences between the two local races were observed in such characters as days to 50% hatching and total length of hatched larvae. The larvae of the landlocked form hatched out significantly earlier than those of the amphidromous form. The egg diameter and total length of the landlocked form hatched larvae were significantly shorter than those of the amphidromous form. Paternal effects were found when comparing these reproductive characters between intra-racial and inter-racial crosses, which suggests that these differences between the two local races might be determined by genetic factors.
公益社団法人日本水産学会の論文
1995-03-15