漁場の研究-II : オコツク海におけるサケ・マスの回游と海況との相関について

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Previously, authors reported on the constitution of salmon fishing grounds, the distinctive condition of sea water, and the result of fishing experiments in the Okhotsk Sea, and suggested four sea areas as available fishing grounds. In the present paper they examined the correlation between the migration of salmon and the characteristics of sea water from the data made available by the “Hokusei Maru” of the Faculty of Fisheries Hokkaido University and the “Kumamoto Maru”, “Ariiso Maru”, the research vessel of the Government, from June to August, 1963. The results obtained are as follows; The salmon which migrates to the west coast of Kamchatka and the North Okhotsk are distributed densely in the water mass which flows into the Okhotsk Sea from the Pacific Ocean, especially into the right portion of it (Fig. 1). In this sea area the surface tempera-ture and salinity are high and the vertical variation is insignificant, and also the minimum temperature is high in the dichothermal water. The salmon of the Saghalien and the Amur pass mainly over the Etorofu Strait, thereafter fish schools concentrate at the front of a discontinuous zone which is composed of two water masses between the Tsushima Current and the East Saghalien Current. Then schools move gradually northeastward along the northside of the Kurile Islands; though some of them move toward the west coast of Kamchatka, most of them turn their migrating direction toward the NNW in the middle part of the Kurile Islands. It is deduced that the migration route is located along the eastern edge of the East Saghalien Current.
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漁場の研究-II : オコツク海におけるサケ・マスの回游と海況との相関について

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