Tilapia winter conservation measures

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Tilapia is a tropical fish that gradually freezes when the water temperature falls below a certain temperature. Except for the natural wintering in parts of southern China, other areas must adopt wintering conservation measures.
1. Preparation before winter (1) Preparation of wintering ponds Wintering ponds should be constructed in places with sunny leewards, good water quality, proximity to water sources, and convenient transportation.
(2) Fish species: Select from the fish species cultivated in the special pool for autumn seedlings, the size is 3-4 cm, and the survival rate is high in winter. If the specifications are too large, the utilization rate of wintering ponds is not high, and if they are too small, the survival rate of wintering is low. Select the remaining species of fish but also pay attention to choose a healthy, non-injury, disease-free body surface smooth individual, according to different specifications size pool overwintering.
(3) The time and density of overwintering fish entering the pool 1 The time of entering the pool for overwintering fish into the pool should be controlled when the water temperature drops to 20-22 °C. The specific pooling time varies with the climate in different places. However, it must enter the overwintering pool when the water temperature is above 20°C. It must be completed before the first cold current. If the water temperature is lower than 16°C, then the catching fish cannot be used for wintering, because the fish body has frostbite and enters the pool. Will continue to die. Fishing overwintering fish should choose wind and sunny weather, so as to avoid fish frostbite.
2 Into the pool density The density of wintering fry into the pool should be based on the wintering pond environmental conditions, the size of the fish body, generally 3 to 50 thousand per mu.
(4) Overwintering Mode 1 Hot Spring Water Overwintering The use of hot spring water for wintering is ideal, with less investment and good results. According to the temperature and flow rate of the hot spring water, excavate the overwintering pool in the corresponding area near the hot spring water, and maintain a water depth of 1 to 1.2 meters. Excavate the outlet at the opposite bank of the inlet of the pond so that the amount of inflow and the amount of water are similar to maintain a certain depth of water. And temperature. Some hot spring water is very hot. After being cooled to a certain temperature, it is injected into the overwintering pool to maintain the pool water temperature above 16°C. Inlet and outlet should be set up to prevent fish from being caught.
2 Overwintering greenhouses in plastic film greenhouses can be used for overwintering greenhouse structures in winter. In some parts of South China, tilapia fingerlings can be used for wintering in earth ponds that raise fish.
(5) The wintering period for tilapia rearing and management during wintering is relatively long. Therefore, there must be someone responsible for the entire wintering period, and management work should be done to control water temperature, regulate water quality, reasonably feed and prevent fish diseases.
1 Adjust the water quality of the wintering pool should keep the water fresh, dissolved oxygen above 3 mg / l. The warm water flowing through the wintering pond can regulate the water quality through the water flow; the plastic film greenhouse pool is difficult to change the water due to the difficulty of changing the water, and only when the water quality is too strong and the fish floating head is heavy, some new water can be changed or the water quality can be adjusted by adding oxygen. .
2 Rational feeding of tilapia consumes a lot of energy during the wintering period. Therefore, it is necessary to properly feed some baits during winter to increase the ability to resist overwintering. The bait is mainly composed of nutritious baits, rice bran, bran, etc., which are not easy to deteriorate water quality. The amount of feed should be based on the quality of the water and the fish's diet.
(6) Tilapia out of pond after winter:
Tilapia out of the pool after winter should pay attention to the following aspects: 1 there is enough time to stop feeding: generally 7 to 10 days. 2 Pull out the net before going out of the pool to exercise, usually divided into 2 days, the first day after pulling the net to put the fish; the next day after pulling the net on the pool, 2 to 3 hours after the release of fish. On the third day, the net is pulled up after the net is drawn, and it can be transported out of the pond in the afternoon. 3 The tilapia species that are transported in and out of the pond are transported using nylon bag oxygenation or waterwheel plus pure oxygen to reduce fish species damage.

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