Characterization of effluent from semi-intensive brackishwater shrimp ponds
2002
Corre, V.L. Jr | Caipang, C.M.A. | Fortes, N.R. (Philippines Univ. in the Visayas, Miag-ao, Iloilo (Philippines). Inst. of Aquaculture)
Three 1,000 sq m ponds of the Brackishwater Aquaculture Center were stocked with shrimp juveniles, Penaeus monodon (Fabricius) at 120,000 pcs/ha, and cultured for 141 days. The effluent was characterized by analyzing water quality taken before and after flooding the ponds. The observed increased levels of BOD-1, chlorophyll a, total suspended and dissolved solids and hydrogen sulfide of the effluent as the culture progressed clearly show the negative effect of increasing biomass and feed input. Analyses of soil samples taken before stocking and after harvest showed that organic matter, available phosphate, carbon, and nitrogen content increased as the culture progressed. There was low survival rate, ranging from 18.9% to 23.2%, and low production ranging from 449.50 kg/ha to 586.50 kg/ha. These are attributed to the deterioration of the quality of pond bottom and exposure of shrimps to sub- and lethal levels of hydrogen sulfide
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