標識放流結果からみた本邦太平洋沿岸のブリの回遊-I. : 放流・再捕結果

概要

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Data from the tagging experiments of yellowtails, Seriola quinqueradiata, in 1963-65 were analysed to estimate the migration of the fish. Two dimensinal expression of the points of release and recapture of the tagged fish in time and space has been tried by approximating the Pacific coast line of Japan from Hokkaido to Kyushu by a curve and reducing the space into one dimension. The figures illustrated in this way indicate the followings: 1) The large sized fish (mostly adult) migrate southward in the Tohoku (north of Cape Nojima) and Tokai-Nankai (south of Cape Nojima) Regions in the winter-spring season and migrate northward in the summer-autumn season. 2) The small sized young fish show north-south migration within the Tohoku Region but present no evidence of movements within the Tokai-Nankai Region or between these two Regions. 3) The southward migration of the large sized fish in the Tokai-Nankai Region seemed to have occured about one moth earlier in 1964 than in 1965, suggesting a yearly variation in the timing of migration.
日本水産學會の論文