マダイ人工種苗の脊椎異常発生率にみられた親間差

概要

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Four progeny groups consisting of two half-sib families were mixed with each other on the day of hatching, and reared throughout the rearing period in the same tank and net-cage. These progeny groups were sampled on 65, 142 and 232 days after hatching, and identified by the isozyme genetic markers. The incidence of lordosis, brachiospondylie and 23 vertebral individuals were remarkably different between a pair of progeny groups of different females. These two types of anomalies appeared independently in one period in one progeny group. As these progeny groups were given common conditions during the period of rearing after hatching, the differences found among progeny groups may be caused by factors before hatching, such as the physiological conditions of eggs and breeders, and genetic factors.
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