1, clearing ponds and fields
Before raising shrimp, clean up the residual bait, feces, excess sludge and other dirt in the pond to avoid bacteria and viruses gathering in the pond and making the shrimp sick. In addition, it is necessary to clear the field, that is, clean up the miscellaneous fry to prevent them from competing with shrimp for nutrition.
2. Reasonable inventory
According to the size and technical conditions of shrimp culture, shrimp seedlings should be cultivated reasonably, and a small amount of pond water should be used as much as possible before stocking to ensure that the pond water is non-toxic and the shrimp can grow normally.
3. Daily management
Patrol the pond regularly to observe the activity and feeding of shrimp. If any abnormality is found, it needs to be solved immediately. In the high temperature season, we should pay special attention to whether the shrimp has floating head hypoxia and replenish oxygen in time to avoid shrimp death due to hypoxia. It is also necessary to salvage the remaining food residues in time to avoid the deterioration of the residues in the water and destroy the water quality, thus hindering the growth of shrimp.
4. Daily water quality management
(1) in the early stage, it was mainly rich in water. According to the color of water, photosynthetic bacteria can be used more. The water quality thickens in the medium term. Ultra-concentrated active bacteria are used once every 10 day, and later nitrifying bacteria are used once every 10- 15 day to improve water quality and stabilize water environment.
(2) Use raw right ash regularly: 5- 10kg per mu, and adjust the pH value.
(3) Improve water quality and purify substrate: In the middle and late stage of aquaculture, due to the accumulation of shrimp excreta and residual bait, a large number of harmful substances in water, such as ammonia, nitrite, sulfide and organic matter, seriously exceeded the standard, which affected the growth of shrimp and even caused diseases. Therefore, biochemical agents such as ultra-concentrated live bacteria, water transfer king and stone powder should be used to improve water quality and sediments.
(4) Water change: At the initial stage of breeding (about 1 month), only water is added, and water is not changed. Supplement 5- 10 cm of water every day. In the middle and late stage of aquaculture, the water content should be appropriately changed according to the water quality, and should not exceed 30% at a time. After changing water, biological agents must be used every 3 days. It should be noted that shallow, too green or too dark water can easily cause diseases in the early stage of breeding, so it is best to add more water instead of less water in the early stage of breeding, and fill the pool within 20-30 days after stocking.
The above are the requirements for water quality in shrimp culture, and I hope I can help you.