北太平洋水域におけるサケ,マス魚群と水塊の分布・流動状況-I : 水塊の分布と流動状況

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During the 1955 fishing season, in order to determine the movement of good fishing areas of salmon migrating to the waters of western north Pacific, exploratory fishing and simple oceanographic observations including water temperature (0. 10. 25 and 50 meters), water color, and transparency, were carried out every days by 14 research vessels of Nichiro Fisheries Co., Ltd. Although this result was in general agreement with the findings of previous reperts 2) 3) 4) 5) 6) it provided the necessity of some revision as follows. 1. The branch current of Kuroshio which appears off the Gulf of Kamchatka extending through the south offing of Komandorskii Is. during end of May to early June, comes out in, the region Lat. 48°N, Long. 172°-174°E in early May, and moves northwestward as shown by the movement of 4°C (0m.) isothermal line in Fig. 1, A-D 2. The cold water mass which grows along the coast of Kamchatka, flows south or southeastward on the southern part from Cape Shipunskii, as can be seen with the tongue of 3°C (50m.) isothermal line in Fig. 1, C-D. And the eastern head of this tongue is projected as far as Long, 170°E., Lat. 48°N., in middle of May, but it is compressed to the coast of Kamchatka as the branch current of Kuroshio progresses. 3. As a results of previous studies, we have had an idea that the branch current of Kuroshio in the southern offing of the Aleutian Islands has two directions: one is northwestward and another is westward. The study this year showed, however, that the northwestward-flowing branch current of Kuroshio has a wide spread, and comes gradually into the fishing ground from eastward to westward. We have taken this phenomenon as showing the existence of the westward current. Fig. 2 gives the concept of distributions and movements of these water masses.
公益社団法人日本水産学会の論文

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田口喜三郎
日魯漁業KK

北太平洋水域におけるサケ,マス魚群と水塊の分布・流動状況-I : 水塊の分布と流動状況

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