When the dissolved oxygen level is very low (usually less than 4) you will see this type of situation in your pond. Maximum prawn will come to the bank in the early morning.
Solution:
1. Set aerator in your pond and operate 2-3 hours daily
2. Can treat with oxygen tablet in severe vondition
3. Increase water level if it is less than 2.5 feet
4. Reduce algal bloom with proper treatment
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