東シナ海・黄海産マダイ資源の研究-V : 1965年の標識放流結果からみた黄海産マダイの分布と移動

概要

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In order to investigate the distribution as well as direction and speed of movement of the sea bream, Chrysophrys major TEMMINCK et SCHLEGEL, 4, 850 individuals of tagged fish, caught by a bull trawler, were released from October 23 to 28, 1965. The release was concentrated in the 180th, 190th and 371st official blocks situated in the middle part of the Yellow Sea (Table 1, Fig. 1). A total of 791 individuals were recovered by the end of March 1966, with the recovery rate of 16%. 86% of the total number of recovered fishes were recaptured during 30 days after the release. The result suggests that the fishing efforts on the sea bream resources in the Yellow Sea were fairly intensive during this period. It is presumed that no sea bream were distributed in the fishing areas where no tagged fish were recovered. The range of distribution of this species was therefore clear as shown in Fig. 3. They moved in all directions within 30 days after their release, most of them, however, migrated only towards the east and southeast thereafter (Fig. 4). Concerning the speed of movement, no evidence of movement was obtained immediately after the release. The velocity then increased rapidly until around the 20th day, but after that gradually decreased, which probably indicated their approach to the wintering area (Fig. 5).
公益社団法人日本水産学会の論文