TY JOUR TI Hydroacoustic assessment of conditions of spawning migrations of fish on the example of the Prokhladnaya River in the Kaliningrad Region KW hydroacoustic method KW morphometric characteristics of watercourses KW bathymetry KW digital bottom relief model KW geostatistical method Kriging KW Kaliningrad region JO Fisheries AU Aldushin, A.V. AU Novozhilov, O.A. PY 2023 IS 2023 PB FSBI "TSUREN"