Manuring Rates for Production of Blue Tilapia in Simulated Sewage Lagoons Receiving Laying Hen Waste

Abstract
All-male blue tilapia (Tilapia aurea) were stocked at 50 fish per pool in 7-m² plastic wading pools which received direct input of laying hen manure at the rates of 0, 35, 70, or 140 kg dry weight per hectare per day during 1978 and 70, 140, 210, or 280 kg dry weight per hectare per day during 1979. On the basis of growth and survival of blue tilapia and of water quality data we suggest that the manuring rate in summer should be between 70 and 140 kg per hectare per day, depending on the alkalinity of the water.

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