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The population structure of the ocellate spot skate (Okamejei kenojei), distributed in the western North Pacific, was assessed on the basis of genetic variations in the mitochondrial DNA control region (mtCR) and differences in morphological characters and features. Significant genetic differentiation in mtCR was observed among 6 regional populations along the Japanese Archipelago and Korean Peninsula. Unique haplotypes found in Osaka Bay and off the east coast of Kyushu Island suggested an absence of gene flow from the other 5 regions. In addition, comparisons of morphological characters and features, including measurements, nuchal thorn counts, differences in maturity size, and coloration, indicated that populations of ocellate spot skate from Osaka Bay and from off the Pacific coast of northern Japan were clearly distinguishable from 4 other regional populations. Together with molecular differentiation among the regional populations, they suggest that the straits, ocean currents, and limited migrations are significant barriers to gene flow between populations. Future fisheries management of the species is discussed on the basis of the present findings.

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