In shrimp nurseries, cutting insects (Notonecta sp) are present and kill the PL. How to control them?
Spread palm oil over the water surface at the rate of 15- 20 litres/ha in the evening hours. 52. After three months of culture there are a lot of shrimp that are weak and unhealthy with thin bodies and that are growing slowly, why? This problem is related to the shrimp consuming the available natural food supply and also to seasonal pond preparation to control the water colour around day 40-70 of culture. This problem is best avoided in the first place by preparing the pond well before stocking. If it occurs, try to remove the waste from the pond using pull chains, increase dissolve oxygen with aeration and try to control plankton bloom. 53. Preparation of water colour before releasing the PL is difficult, the pond water colour only turned green for 2-3 days and after that the water became clear. How can we get an adequate algal bloom in the pond? Some of the possible causes of this problem are: 1. There is not enough fertilizer in the pond to support a phytoplankton bloom. 2. There is
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