By Sascha W. Felix
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0 cm instead of stocking small post larvae directly into the rearing ponds. This can be done in well-prepared nursery ponds or tanks. Hapa nets have been found to give poor survival. It is better to stock directly into the pond than using hapa nets for nursery rearing. One of the problems with stocking directly into a rearing pond is that it is almost impossible to assess their survival at that stage. A farmer for a catchable size has to wait until the shrimps grow before he knows whether they are alive or otherwise.
28 22 50 Clay – – Very abundant 2. 15 44 42 Silty Clay Loam Abundant 3 63 14 23 Sandy Clay Loam Few 4. 79 10 11 Sandy Loam – Very few Growth of Benthic Algae Soil Texture Preparation of the pond soil is very important in growing “lab-lab”. To assure a uniform growth of algae, the pond bottom should be leveled so that there are no high points or depressions. The pond bottom should not be hard but must be firm enough to serve as a holdfast for the algae. Compacting the pond bottom is normally done by drying.
The relationship between soil texture and algal growth can be seen in Table 1. Table 1: Soil Quality Vs. No. Percent Sand Per- cent Silt Percent Clay 1. 28 22 50 Clay – – Very abundant 2. 15 44 42 Silty Clay Loam Abundant 3 63 14 23 Sandy Clay Loam Few 4. 79 10 11 Sandy Loam – Very few Growth of Benthic Algae Soil Texture Preparation of the pond soil is very important in growing “lab-lab”. To assure a uniform growth of algae, the pond bottom should be leveled so that there are no high points or depressions.
Advances in shrimp aquaculture management by Sascha W. Felix