Effluents from Intensive Culture Ponds of Tiger Prawn (Penaeus Monodon Fabricius)

Abstract

Quality of the effluents during growing period of tiger prawn from five intensive culture ponds in the eastern coast of theGulfofThailandwere monitored. The effluents discharged into recieving water containing 11.6-251.0 mg/l of total suspended solid. Biochemical oxygen demand of the effluents were between 2.5 and 60.5 mg/l. Phosphorus content varied from 0 to 0.1018 mg/l as P for soluble orthophosphate and from 0.0069 to 0.7236 mg/l for total phosphate. Ammonia nitrogen concentration in the effluents were between 0.0021 and 0.8676 mg/l. Nitrate nitrogen was found in low concentration between 0 and 0.0263 mg/l as N. However, the accumulation of nitrite in the effluents were recorded in certain sampling period with the highest concentration of 0.4094 mg/l as N. The effluents had pH between 7.1 and 8.9, dissolved oxygen between 2.8 and 13.8 mg/l, salinity between 9 and 36 ppt, and turbidity between 2 and 68 NTU.