日本海へ来遊するブリ成魚の来遊量指数とその年変動

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This paper treats variations in the abundance of adult yellowtail which migrate into the Sea of Japan. With catch data in some fishing grounds along the coast of the Sea of Japan, theauthor derives an index of the population size of adult yellowtail immigrating into the Sea of Japan. The index is defined as the geometric mean of catch data at five fishing grounds. The fluctuation of this index corresponds well to that of sea level difference between Izuhara and Pusan in the western channel of the Tsushima Strait. However it does not correspond to the fluctuation of sea level difference between Hakata and Izuhara in the eastern channel of the Tsushima Strait. On the other hand, an exponential decreasing tendency is seen in the index over theperiod of 1975 to 1986. This probably means a decrease of adult yellowtail stock around Japan in the recent 30 years.
日本水産學會の論文