母船式鮭鱒沖取漁場の表面海流と海況

概要

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From middle of May to early August in 1953, survey of surface current was carried out by Salmon Factory Ship with current meter at the west Aleutian and South eastern Kamchatka regions. Observation were made simultaneously at the layer of 25 and 500 meters. Direction and speeds of surface currents were estimated as relative values to those of 500m layer in conception of that no current is present in the layer of 500m. Table 1. shows the result of the observation, and figures 1-8 show water currents relative to distributions of water masses and transparency in every 10 days. As the results of the present research, some presumption given below may be drawn out. In the southern offing of Aleutian Is., the current which flows to south from Bering Sea goes into the water mass which runs northwards, and in this contact zone current moves westerly with velocity of 0.5-1.0 miles per hour. The current that flows to the W or NW with velocity of 2-4 mils per hour exists in the intermediate region of Aleutian Is. and Kamchatka Pen. With above results, we may conclude there are counter currents of Kuroshio in the region of Kamchatka and West Aleutian, and the counter currents flow towards west or northwest. It may be decided that the salmon migrate to Kamchatka from West Aleutian region depending on these currents.
公益社団法人日本水産学会の論文