マダイの肝臓エステラ-ゼにみられる遺伝変異について

概要

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A distinct variation was found in the electropherogram of esterase of the red sea bream Pagrus major (TEMMINCK et SCHLEGEL) collected from the waters of Japan and the offsprings bred artificially by natural spawnieg method in the culture pond. It was presumed that there are eight alleles at the esterase locus on the basis of the electrophoretic polymorphism. Seventeen of 36 phenotypes theoretically expected were found. The validity of genetic model presumed on the esterase locus was ascertained by the test of goodness-of-fit of the phenotype frequencies and the Hardy-Weinberg expectations. The frequencies of allele d ranged from 0.116 to 0.138, allele e from 0.531 to 0.643, allele f from 0.185 to 0.281, in natural samples. In the frequencies of alleles d, e and f, there was no statistical difference among the natural samples. On the other hand, variation in the allele frequencies of esterase locus caused by the "WRIGHT effect" (random genetic drift) was actually observed among the samples obtained by artificial breeding.
日本水産學會の論文