北西部太平洋におけるビンナガ鮪漁場動態に関する研究-2-

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The purpose of this study is to explain the variety of the life zone of Albacore in the winter-summer period under the influence of the fluctuations of the oceanographical conditions in the southern waters off Japan (Lat. 28-36°N, Long. 135-145°E). The principal information, obtained from the analysis of yearly fluctuations of isotherms of sea surface, are as follows; 1) Oceanographic conditions can be classified into three patterns of C, L and C-L type, by existance or non-existence of so-called Cold Water Masses which appear frequently in the southern waters off Japan. 2) It seems reasonable to assume that the migration and distribution (pattern) and the formation of fishing grounds of Albacores in the winter-summer period have patterns which adapts itself to each oceanic pattern. 3) Its is found that migrations of Albacores in winter are controled by the Cold Water Masses which can be regarded as "environmental resistance" or "environmental barrier." Therefore fluctuations of the distrubution and fishing grounds occur according to the formation of the Cold Water Masses. 4) It can be said that fishing ground of summer Albacore moves to the west or east by oceanographic conditions mentioned above in article (3), and fishing season also begins early or later.
社団法人日本水産学会の論文