年令組成からみた北洋ベニザケ成魚の系群と回遊について
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概要
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he distributional pattern of each population of red salmon which came migrating to the fishing grounds for the Japanese mother ship salmon fishery in summer, 1960 was tentatively examined mainly based on the appearance of dominant age groups. The samples used for this purpose have been obtained every five day unit from various unit areas limited by longitude 1° and latitude 1°, respectively. Our first examined population, which have belonged apparently to the East Kamchatka type, was especially dominant in number during the period between May and late June in the North Pacific waters lying from the southeastern coast of Kamchatka to nearly as far east as longitude 173°E, with their southern bounds in latitude 47°-48°N (Fig. 2). This population was chiefly composed of the 52 and the 63 age groups of 3-ocean-year-old salmon. Those red salmon migrating to Olyutorskii District were dominant in number late in June in the western part of the Bering Sea bounded by 58°-60°N and 171°-178°E, mainly represented by the 52 and the 63 age groups, as was seen in the East Kamchatka salmon. The West Kamchatka red salmon, which were mainly composed of the 53 or the 42 age group of the 2-ocean-year-old ones, seemed to have come migrating from some farther south to the northern limits of the North Pacific, west of longitude 174°E. The 53 age group appeared at first rather in plenty early in June in the waters bounded by 46°-48°N and 160°-170°E, and then rapidly extended northward, until in July the group was seen in nearly all the waters where those salmon of the East Kamchatka type had been found abundantly in May or June. As to the 42 age group, it was dominant in number from the middle of July till the latter part of the same month in the same waters where the 53 age group had been plentifully found in June and July. Red salmon, which have their origin in the Bristol Bay, Alaska, made their appearance in May or in June in the Bering Sea and the waters around the Aleutian Ids, lying between 50°-56°N and 171°E-178°W (Fig. 2). Age composition characterized this group of salmon in 1960, for the 42 age group was very dominant in number.
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