When wintering tilapia, the key is to grasp the time of entering the pool during overwintering, fish pond disinfection, stocking density, adjustment of water quality and water temperature, feeding and management, and disease prevention and control techniques.
First, the time to enter the pool should be completed before entering the pool.
2. Before disinfecting the winter, fishponds, pipes and channels must be treated with lime, bleach or other disinfectant.
Third, the choice of overwintering fish should be selected plump, scales without damage, body rich mucus. Don't fish in pond mud.
4. After the water temperature and its regulating fish enter the overwintering pool from the pond, in the first 7 days to 10 days, the water temperature should be adjusted between 20°C and 25°C, and the water temperature during wintering should be maintained between 16°C and 20°C. , should prevent sudden changes in water temperature, but also should prevent the water temperature below the lethal temperature. In addition, we must pay close attention to weather changes to avoid accidents and make necessary preparations for warming up.
5. During the aerobic wintering period, regular analysis of water quality should be carried out. Attention should be paid to observing the floating head of the fish. Oxygen-intensifying measures should be taken in time, and the dissolved amount should be kept above 4 mg/L.
Sixth, sewage and water changes during the wintering period should be regular sewage and water changes, in order to maintain good water quality. Should be dirty or flushing once a week to 2 times, every 3 days to 4 days change the pool of water about 30%.
VII. Stocking Density Generally, every cubic meter of water can be stocked with 15 to 25 broodstock or 200 fishes with a stock size of 10 cm or less. With good pool conditions, 30 to 40 broodstock or 400 to 500 fishes can be stocked per cubic metre of water. Eight, moderation feeding should be appropriate according to the water temperature, fish feeding activities appropriate feeding. The bait is mainly green barley and is fed with green vegetables. However, tilapia is gluttonous and has more defecation, which can easily pollute water quality. Therefore, the amount of bait should be properly controlled. Nine, to prevent fish disease into the wintering pool before the fish should be disinfected, with 1 kg to 1.5 kg of salt plus 50 kg of fresh water dip. Use copper sulfate and ferrous sulfate once a month to disinfect once or twice a second. Appropriately control the stocking capacity of wintering ponds, excessive stocking densities must increase the feeding amount accordingly, and pool water can easily cause oxygen deficiency.
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