Advances in shrimp aquaculture management by Sascha W. Felix

By Sascha W. Felix

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After one week, the same amount of fertilizer is applied and the water level is raised to 10 to 15 cm. The fertilization is repeated after the second week and the water level is raised to 20 to 25 cm. Additional water may be added to make up for compensating loss due to evaporation. It is also recommended for refertilization once in seven days during the culture period. (b) Phytoplankton The phytoplankton is composed of small plant matters which float in the water. While phytoplankton does not serve as a direct food for shrimps, its production level indicates the functionality status of shrimps.

In P. semisulcatus, the chromatophores are prominent only on the sixth (last) segment. P. monodon is larger than P. semisulcatus and has a distinctive habit of swimming with its head lower than its tail and the body is kept at about 45o. The post-larvae of P. monodon and P. semisulcatus can be separated by the following characteristics. Table 6: Characteristic Differences Between P. monodon and P. semisulcatus P. monodon P. semisulcatus • Brown pigment distributed evenly but more • Brown pigment distributed only on the anterior intensively on posterior part of telsion.

This can be done with a hand pulled harrow. 5 tons of agricultural lime per hectare. 5 tons is worked into the soil. Application of lime of calcium carbonate (calcite) may not be suitable particularly when pond water attains seawater pH. Though agricultural lime may raise the soil pH, it will not be effective in maintaining suitable pH in the pond water. g. dolomite, mollusc shells or coral) which contain about 4 percent magnesium are more soluble at seawater pH and they could aid in maintaining optimum alkalinity and pH levels in the pond water (King, 1973).

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