Effects of feeds on the particulate organic matter content of water of prawn ponds at two stocking densities
1995
Janeo, R.L.
A study was conducted to determine the effects of feeds on the particulate organic matter of prawn ponds at two stocking densities in split-split plot design. The stocking densities were: 32,000/ha (Trt. 1) and 68,000 (Trt. 2). Four one hectare ponds were used and divided into two sampling points, the downwind (S) and upwind (N) corners, while sampling was done before (M1), and after (M2) water exchange. Feeding significantly increased the level of particulate organic matter in the water but did not appreciably increase the organic matter content of the soil. Results showed a highly positive correlation of particulate organic matter with Biochemical Oxygen Demand, NH3-N,NO2-N, phytoplankton density, chlorophyll and soil organic matter while a highly negative correlation was observed with dissolved oxygen. Correlation analysis on particulate organic matter with other parameters such as temperature, salinity, pH, phosphate and total nitrogen gave low and non-significant coefficients (P0.05). Analysis of variance further showed significant differences between management levels but not with treatments and wind directions in almost all of the parameters analyzed
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