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acid acre Africa amount animals artificial bacteria blue-green algae breeding carbon dioxide cattle cent chironomid combined nitrogen common carp contain crop of fish cultivation cycle dissolved oxygen drained dry period dry season example farm fish feed feeders ferric fertile pond filamentous algae fish crop fish culture fish farmer fish farming fish production fishponds fodders food chain freshwater give grass carp green plants grey mullet grow grown growth hectare Ib/acre important increase kg/ha Lake land large numbers larvae lime limestone Malacca manure maximum standing crop mg/litre midge larvae natural nutrient salts offish organic matter oxidation oxygen content phosphate photosynthesis phytoplankton plankton plant material plant plankton poisonous pond bottom pond soil ponds ponds with limestone potential energy production ponds protein pump rainbow trout rate of fish rate of production river sewage silver carp snails stocked sunlight supply surface layer temperature Tilapia Tropics unfertilized vegetation water-weed zooplankton