日本海西部に於けるシイラ漁況の研究-1-

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The dorado, Coryphaena Lippurus LINNÉ, a blue water fish, migrates to Japan sea during Spring Summer season with prevalence of the Tsushima current, a warm one, and supports an important fishery in the sea. Neverthless few ecological studies have been carried out on the fish. Hence the presnt writer has made an ecological analysis on the fish migrating off Shimane Prefecture. The results arrived at are as follows:- (1) The fish seem to run along 18-19°C line, and to inhabit the waters of above 31.0‰ in salinity (Figs 1-5, Table 1-a, b). (2) Decrease of the catch in Summer season from middle of July to early August appears to be due to the effect of low salinity water mass happened in East China Sea region in rainy sea-son of the region and coming to the fishing grounds of the fish. Also the amount of the catch seems to be influenced by the water color of 0-10m layer (Figs 6-7). (3) Good catch may be appeared in a cyclic period of 3 or 7 years corresponding to top year of prevalence of the Tsushima current (Table II, Fig. 8)
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