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First, choose a fish pond.
It is best to choose fish ponds in the village side, fish ponds in front of the homes, fish ponds in the outskirts of the town, and fish ponds in the sugar cane forest, bamboo forest, and trees. These fish ponds generally have houses and trees on both sides of the west and north as natural barriers to block winds, so as to block the cold wave attacks, and the changes in water temperature are relatively small, which is conducive to wintering. The area of ​​fish ponds is 2 to 3 acres, and the wind surface is small. After the fish ponds have been selected, clear the ponds to disinfect them and eliminate all pathogens, thus creating conditions for the safe passage of the two fishes.
Second, timely release of water.
Increasing the water depth to increase the temperature of fish ponds is the most basic task for protecting the safety of farmed fish during the winter. According to many years of investigation, where there are trees with a water depth of 2.5 meters or more, they basically meet the requirements for thermal insulation. Therefore, it is important to store enough pond water as soon as possible so that the water depth can reach 2.5 meters or more. For the inconvenient drainage and drainage, you can dig a “fish bed†in the west and north of the fish pond to make the water depth reach the requirement of protecting the winter. In the cold wave attack, the fish in the pond are concentrated in the “fish bed†to keep warm.
Third, cover windproof, cold shelter.
For fish ponds that do not have houses or bamboo wind, wind and cold shelters should be built. Windproof and cold-proof sheds can be made of straw or sugarcane leaves, and each is a grasshopper of 3m and 4m in size, and then fixed on the west and north sides of the fish pond with a bamboo frame to tie the grasshopper well so as to block the invasion of cold tide. It is necessary to cover the slopes of grass ponds on the west and north waters of fish ponds. The front end is about 67 centimeters away from the water. The back end is close to the edge of the pond, and some straw should be thrown under the shed. When the cold wave strikes, the fish can cluster under the turf. Warm up and keep warm.
For tilapia broodstock ponds, a semi-circular scaffold is placed on the edge of the pond with bamboo or fine steel bars and covered with a thin film on a scaffold to create a cold-resistant greenhouse. It is sunny at 10:00 in the afternoon. : 00, to open the film in order to achieve the purpose of air ventilation, to ensure that the broodstock safe winter.
Fourth, dig drains.
Digging a ditch with a depth of 0.5 meters and a width of 0.7 meters around the wintering fish ponds is very important. Since the cold wave continues southward, it often causes rainy and cold weather, and the rainwater has a lower temperature than the pond water. Afterwards, the rainwater can be drained out of the pond to keep the water temperature in the pond stable.
Tilapia winter cold-proof measures
Tilapia has the characteristics of omnivorous food, crude, long, easy to grow, low cost, low disease, etc. It is the main breeding fine variety in our province. However, the fish are tropical and subtropical fish. When the cold air flows south, when the water temperature drops to about 10°C, there is a danger of freezing and frostbite. The weather is getting colder, so be sure to do a good job of keeping the cold out and protect the tilapia safely for the winter.