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Polymorphism of Malate Dehydrogenase and Genetic Structure of Juvenile Population in Saury Cololabis saira

A screening of malate dehydrogenase (M D H) isozyme composition of skeletal muscle from two population samples of saury juvenile collected at Suruga By revealed three phenotypes existing in high frequencies. The electrophoretic patterns and the frequency distributions of three types in the samples indicated that the M D H isozymes are dimers formed by random association of two subunits under the control of separate genetic loci, and three types are attributed to two alleles at the B locus of two loci coding for the enzyme. Both of the two samples of juveniles were composed of the three types in a stage of genetic equilibrium with respect to the B alleles, and each appeared to be a group of individuals having a certain genetic structure.