標識放流結果からみた本邦太平洋沿岸のブリの回遊-6-相模湾およびその周辺における移動

概要

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Data from the releases of 224 yellowtails in Sagami Bay, central Japan, in 1963-65, together with the daily catches obtained in each set net in the bay, were analysed to study in detail the movement of this fish in the bay. The yellowtails occurred in the catches in a wave-like fashion at intervals of about 20 days during the fishing season which generally extended from January to May. The movement of the tagged fish are classified into four types: a) southward migration, b) rapid movement in the bay along the coast, c) continued in the bay for a relatively long time and d) northward migration. Some co-relationship was observed between water temperature and the movement. In the 1963 season, the water temperature was extremely low and the catch was very poor. The temperature rose unusually high toward the end of the season in 1964, and the fish tended to move northward and the fishing season ended about 20 days earlier than in 1965. The temperature was slightly high in January of 1965 and the opening of the fishing season was delayed. But thereafter, it remained within the suitable range and the fish tended to stay in the bay providing a good catch.
日本水産學會の論文