TY JOUR TI EFFICIENCY OF RAINBOW TROUT CULTIVATION IN THE RECIRCULATING WATER SUPPLY FACILITY WITH THE USE OF STATE SUPPORT (WITH THE SARATOV REGION AS A CASE STUDY) KW fish farming; rainbow trout; project; efficiency JO Fisheries AU Vasilyev, A.A. AU Rudneva, O.N. AU Rudnev, M.U. PY 2020 IS 2020 PB FSBI "TSUREN"