大西洋におけるメバチの漁獲分布

概要

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The long-term mean distribution of bigeye tuna Thunnus obesus in the Atlantic Ocean was examined by using the 1963-80 catch-effort data of the Japanese tuna longline fishery. The results of the study were as follows: 1) Recently, Japanese tuna longline vessels are concentrating their efforts on quality sashimi fish, such as the bigeye tuna, bluefin tuna T. thynnus and the southern bluefin tuna T. maccoyii. 2) With the exception of the Mediterranean Sea, bigeye tuna have been caught in a very broad area of the Atlantic, bounded by lat. 50°N and 45°S. While the species was very broadly distributed, the more productive areas were, however, quite restricted, as follows: (a) From off New York to the Grand Banks; the high latitude areas northwest of Las Palmas; and the tropical region (lat. 5-15°N) extending continuously between Dakar and the northeastern coast of South America. (b) From along the coast of South Africa, centered off Angola, westward to off Recife. (c) Off Montevideo. 3) Of the productive areas mentioned above, the catches were particularly good in the waters extending from off New York to the Grand Banks, in the western Atlantic such as off Montevideo, and the coastal waters of the eastern Atlantic such as off Dakar and Angola.