C0301 Step 7. Water Management

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1 Exchange water carefully
2 Regularly check the water quality
parameters
3 Use agricultural lime after every
water intake
4 Always use double layer water filter net of 300 micron mesh size to filter the in-take water
5 Maintain adequate oxygen level in water

For first month, there should not be any water exchange. Starting second month, if necessary, water exchange can be done but try to minimize it as much as possible
Release the water when the plankton bloom is too thick (dark green water).
Do not release or in-take more than 15-30 cm depth of water per day.
Take the water in only when there is no disease in the shrimp pond cluster.
Always use double layer water filter net of 300 micron mesh size to filter the in-take water.
Use agricultural lime after every water intake / exchange and after rains. It acts as a buffering agent for water.
Regularly check the water quality parameters
– If the pH is lower than 7.5 apply shell lime to increase the pH.
– If the pH is higher than 8.5, exchange the water to reduce the pH.
8. Water colour should be green / brown colour
– Not turbid.
– Not transparent.
– Not dark green/ dark brown colour (heavy plankton bloom).
9. Alkalinity =100 ppm. Use alkalinity instant test kit.
Remove benthic algae, fi lamentous, and hydrilla
Maintain adequate oxygen level in water
If oxygen levels deplete in the pond, shrimp will start swimming near the water surface especially during early morning period.
DO should not fall below 4 ppm; if concentrations fall below 3 ppm during night and early morning, use pump to aerate water by spraying over pond. Exchange the water if
essential and if there is no disease outbreak in nearby ponds.

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