1969年の標識放流結果からみた東シナ海産タチウオの分布と移動

概要

論文の詳細を見る
The ribbon fish, Trichiurus lepturus LINNÉ, is an economically important species in the East China Sea and the Yellow Sea. The amount of its catch has reached 50, 000-56, 000 tons (1967-69), which is equivalent to about 17% of the total catch of demersal fish. A total of 2, 561 fish out of the East China Sea population caught by angling were tagged and then released in the 329th, 330th, and 340th official blocks (Table 1, Fig. 2). Fifty-five individuals were recovered by the end of March, 1970, which gave a recovery rate of 2.1%. 45% of the total number of the recovered fish was actually recaptured within two months after they were released (Table 2). The comparison of the monthly distribution of the population density and the results of tagging indicated that the ribbon fish moved from the releasing areas toward the western seas off Quelpart Island and also up to 35°N (Fig. 6). Based on the present findings, it could presumably be suggested that there is considerable intermingling between the two populations of ribbon fish, the Yellow Sea population and the East China Sea population.