TY JOUR TI RESULTS OF ATLANTIC SALMON INVESTIGATIONS IN NORTHERN DVINA RIVER DURING FISHING FOR RESEARCH PURPOSES KW Atlantic salmon KW Northern Dvina River KW migration KW catch per unit of effort KW biological parameters JO Fisheries AU Studenov, I.I. AU Chupov, D.V. AU Ustyuzhinskiy, G.M. AU Tortsev, A.M. PY 2020 IS 2020 PB FSBI "TSUREN"