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First, choose a fish pond
The best is the village edge ponds, entrance ponds, fish ponds in the outskirts of the town, and fish ponds in the sugarcane 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 2-3 mu, 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 the author's many years of investigation, where the depth of the water is more than 2.5 meters and where the trees are sheltered from the wind, 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 “bed of fish†on the west and north sides of the fish pond to make it deep enough to meet the cold winter requirements. When the cold wave strikes, the fish in the pond are concentrated in the “fish bed†to keep warm.
Third, cover wind and cold shelter
For fish ponds that do not have houses or bamboo wind, wind and cold shelters should be built. The two kinds of sheds can be made of straw or sugar cane 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 grasshoppers 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. Some straw should be thrown under the shed. When the cold wave strikes, both fishes will be in a mess. Warm up in the grass.
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 film on a scaffold to create a cold-resistant greenhouse. It is a sunny day from 10 am to 3 pm At the time, the film should be opened to achieve the purpose of ventilation and light transmission to ensure that the broodstock is safe for 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 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 sub-tropical. When the cold air blows south, the water temperature drops to around 10°C and there is a danger of freezing and frostbite. As the weather is getting colder, it is important to do a good job of protecting the cold and protect the tilapia safely for the winter.