TY JOUR TI BASIS FOR OPTIMIZED EXPLOITATION OF SIVRUGA POPULATION (ACIPENSER STELLATUS PALLAS, 1771) IN VOLGO-CASPIAN FISHERIES AREA USING BEVERTON – HOLT MODEL KW stellate sturgeon KW stock KW growth rate KW commercial and natural mortality KW Beaverton –Holt model KW age of entry into the fishery JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Safaraliev, I.. PY 2013 IS 2013 PB Astrakhan State Technical University