海流浮標の漂流結果からみた母船式サケマス流網漁場内の表層流について

概要

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Through the oceanic investigations in the past, it is known that the migration of salmon coincides with the movement of certain oceanic currents. Based on this finding, investigations of current movements by means of buoys were conducted in 1958 season, in order to clarify the migration pattern of salmon. Nine thousands eight hundreds fifty five buoys were released and 1533 were recovered, making the rate of recovery about 15%. Results of the above investigations suggest that: 1. In the waters between Kamchatka Peninsula and the western Aleutian Islands, there is an anti-clockwise current in the summer season. 2. In May, the center of this current is located around 170°E and 50°N, and it gradually moves westwards. 3. In June, the center of this current is found around 165°E and 50°N, and then it moves in the northwest direction. 4. In July, the center of the current makes little movement, and toward the end of July it begins to move southeastwards. 5. The above-mentioned movements of the center of the current indicate that through May and June the influence of the warm current moving northwestwards in the southern part of the North Pacific becomes predominant, while the cold current moving southwards along the Kamchatka Peninsula decreases its power, and that beginning in July, this relation of strength between the warm and cold currents is gradually reserved.
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