TY JOUR TI THE IMPROVEMENT OF BIOPSY METHOD FOR ESTIMATION OF FISHES’ GONADS MATURATION STATE DURING ARTIFICIAL BREEDING KW aquaculture KW reproducing KW sturgeons KW carp KW hybrids KW gonads KW tester rod KW biopsy KW maturation stages JO Fisheries AU Bubunets, E.. AU Novosadov, A.G. AU Zhigin, A.. AU Labenets, A.. PY 2020 IS 2020 PB FSBI "TSUREN"