TY JOUR TI Testing of the nest-incubator of chum salmon roe (Oncorhynchus keta W.) in small rivers of the Sakhalin region KW salmon fish species KW artificial incubator nests KW multilayer-10000 KW chum salmon KW Pacific salmon KW rivers of the Sakhalin region JO Fisheries AU Efremov, D.A. AU Skorobogatov, M.A. AU Veselov, A.E. PY 2021 IS 2021 PB FSBI "TSUREN"