マカジキに関する水産海洋学的研究-1-サンゴ海における漁期,漁場と魚群の移動
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The distribution of striped marlin, Tetrapturus audax, in the Pacific Ocean is known to form a horseshoe-shaped pattern, extending both ways to the northwestern and southwestern Pacific with the eastern tropical Pacific the apex. The southern Coral Sea fishing ground which is located in the western extremity of the South Pacific Ocean is known to be an important spawning ground for the species. To study the spawning stock, the author examined the fishing season, the shifts in fishing grounds, and the movement pattern of the striped marlin through the analysis of data obtained from the tuna longline fishery. The results were as follows: 1. The catch rate (catch per 100hooks) of striped marlin in the southern Coral Sea usually begins to increase in September, and the fishing season continues until January. The fishing season peaks between November and December. 2. The productive fishing grounds in November and December are located in the area from lat. 20°-30°S, long. 154°-160°E, and also along lat. 20°S in waters off the northwestern coast of New Caledonia. 3. Based on the movement of the fishing grounds, it can be surmised that the striped marlin occurring in the southern Coral Sea have their origin in the eastern Pacific Ocean. In September through the area bounded by lat. 25°-25°S, long. 170°W-180° and later through the area bounded by lat. 25°-30°S, long. 170°E-180°. They subsequently congregate around lat. 25°-30°S, long. 160°E. The movement in the southern Coral Sea is towards the north beginning in October, and southward beginning in January.
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