若狭湾および周辺海域の漁場環境について

概要

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It is very important to understand environment factors of the fishing grounds. In this paper, the author presents the factors of Wakasa Bay in recent years. 1. The surface sea water temperature around Japan is showing a tendency to rise, and a phenomenon was similar in Wakasa Bay. 2. The relationships between the surface sea water temperature in Wakasa Bay and the catching fluctuations of two-year-old and over yellowtail were investigated. As a result, a correlation of both items was suggested. 3. Since 1999, the catch of scomberomorus inhabit in warm waters is increasing rapidly in Japan Sea, and the fish is becoming the important species in Fukui Prefecture. 4. After 2002, a large amount of appearance of giant jellyfish was often observed in Japan sea. It was suggested that a current in Wakasa Bay effected a large accumulation and the long term remaining period of the species.
2011-02-15