TY JOUR TI ENRICHMENT OF FISH FOOD RESOURCES - A PREREQUISITE OF AN INCREASE IN FISH PRODUCTIVITY OF THE LAKE BALKHASH KW Lake Balkhash KW macrozoobenthos KW biomass KW fish diet KW potential fish productivity KW mineralization KW Aral Sea invertebrates KW polychaete and bivalve shellfish JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Anureva, A.. AU Tsoy, V.. PY 2014 IS 2014 PB Astrakhan State Technical University