南太平洋に於けるビンナガの漁況周年変化の海域間の比較及び魚群の移動について

概要

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1) I have studied on variations of fishing condition in a whole year in the sub-areas shown in Fig. 1 and on migration of fish groups in the southern part of the Pacific Ocean in the period from 1952 to 1958. 2) Variations of fishing condition through a year in each sub-area are shown in Figs. 2 & 3. 3) Though the variations of fishing condition through a year in the period mentioned above are nearly periodical, the fishing indexes in sub-areas in each month are considerably different among each year. 4) Monthly variations of fishing condition arranged together in the same month regardless of year in every sub-area are shown in Fig. 4. 5) The stock of albacore in southern part of the Pacific Ocean is divided into two groups, that is, one is northern group and the other is southern one, and each group migrates northward in autumn and southward in spring in the area. 6) It is presumed that the northern fish group is the one for spawning and the southern group is the one for feeding. 7) The season when fish group migrates toward the south in sub-area M is later than that in sub-area W.
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