紀南・伊豆海域のカツオの豊凶に関与する海況について

概要

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An examination of the correlation between the availability of skipjack tuna in the Kinan and Izu regions and the oceanographic factors such as temperature (1955-1973) and salinity (1955-1972) revealed the following: (1) Oceanographic conditions in winter at the E-6 station in Satsunan region were examined statistically. The mean surface temperature of the excellent and good skipjack fishing years (1958, 1959, 1966, 1967, 1972) in the Kinan and Izu regions was 21.2°C, which is significantly higher than 19.8°C, the mean of the extremely poor and poor fishing years (1963, 1965, 1970, 1971). Similary, the mean surface salinity of the excellent and good years (1958, 1959, 1966, 1967, 1972) was 34.81‰, which was significantly lower than 34.87‰, the mean of the extremely poor and poor years (1960, 1963, 1965, 1969, 1970, 1971). (2) It is possible to forecast skipjack fishing condition in the Kinan and Izu regions as well as in other regions through the examination of temperature and salinity distributions in the Satsunan region during the preceding winter unless (a) the year turns out to be a very productive year for albacore fishing, in which case the fishing effort will be diverted from skipjack fishing to albacore fishing, or (b) it happens to be a year in which the skipjack bithing condition is very poor.
公益社団法人日本水産学会の論文