豆南海域におけるマカジキ漁況の研究

概要

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The following results were obtained by analyses of the striped marlin landed at Habu fish market in Oshima. 1. The fishing season begins in January and continues towards the end of June, while the best fishing period is between March and April. The most caught fish is striped marlin (Tetrapturus audax), and other marlins in lesser amounts are broadbill sword fish (Xiphias gladius), black marlin (Makaira mazara), and white marlin (Makaira indica). Sail-fish (Istiophorus platypterus) also in caught. The less caught fishes mentioned above per total catch is of a very small rate, about 2.2%. 2. The landed fish can be divided into two groups from their average body weights for each month. 1) The first groups body weight ranges from 55kg to 50kg, and is mostly caught between January and May. 2) The second groups body weight is in the range of 30kg, and is usually caught in June. 3. There is a relationship (r=-0.77) between the average distance of the Kuroshio current, from early February to early May (the minimal distance from the point which this current passes throng 140°E. Long to 35°N. Lat.), and fisheries yield. 4. The larger the Kuroshio current passing through at this point (34°N. Lat. & 139°30 E. Long.), the greater appears the yield. So we can forecast striped marlin fishing conditions from a forecast of the Kuroshio current.
公益社団法人日本水産学会の論文