Surface water type and distribution of juvenile fishes and cephalopods in Pacific coast waters of Hokkaido and the Kuril islands in summer, 1989 [Japan]
1990
Ueno, Y. (National Research Inst. of Far Seas Fisheries, Shimizu, Shizuoka (Japan)) | Shimizu, I. | Shershnev, A.P.
The purpose of this report is to present the relationship between the distribution of fish and cephalopod species and surface water type in the coastal and offshore waters on the Pacific side of Hokkaido and the Kuril Islands based on the survey of R/V Wakashio-maru in summer 1989. Fishes of 27 species and cephalopods of 6 species were collected with finemeshed purse seine, dip-net, and surface trawl net. The results of oceanographic observations showed that Oyashio Water (Kuril Current Water) occupied almost the entire research area. The authors divided the area surveyed into three types of regions characterized by the temperature and salinity at the surface. The three water regions were 1) the coastal water, 2) the surface warm water, and 3) the cold water. In the coastal waters, 12 fish and cephalopods species were observed, and juvenile chum salmon (Oncorhynchus keta) showed high abundance. In the surface warm waters, 26 species were observed, and both juveniles and adults of true sardine (Sardinops melanosticta), Japanese anchovy (Engraulis japonica) and Pacific saury (Cololabis saira) occurred in abundance. In the cold waters, 19 species were observed, and Gonatus middendorffi (juvenile) were plentiful
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