Practical Technique of Pond Film Coating for Freezing

The practical anti-freezing technology of pond mulching is mainly used for most warm water fish (such as tilapia, puffer fish, California perch, etc.) to survive the winter safely in ordinary ponds when the winter temperature is lower than 10 ℃. Before the cold air comes, deepen the pond water and cover the appropriate greenhouse film according to the pond conditions in advance, so as to maintain the water temperature of the pond and ensure that fish and shrimp survive the winter safely. Main technical contents: 1. Simple greenhouse overwintering method: when the width of the pond is less than 20 meters, the whole pond can be supported with steel pipe to support the arch frame, covered with two layers of plastic film, connected with the edge of the pool into a sealing cover, and can be sealed with mud around. The height of the greenhouse is about 60-80 cm higher than that of the pond. If the temperature is below 0 ℃, steam pipes or hot water pipes can be used to warm the pond water to ensure that fish and shrimp survive the winter. 2. Simple half-shed overwintering method: (1) when the width of the pond is more than 20 meters, a 1.5-meter-high wind barrier is built with crop straw or soil in the north of the pond, and bamboo is used to support the simple greenhouse between the wind barrier and the pond to prevent the pond from freezing. (2) build drainage ditches around the fishing ponds to prevent snow water from flowing into the ponds. (3) 1-2 cold shelter holes with a depth of 2 meters and a diameter of 0.8 meters can be dug 40 cm away from the bottom of the pool on the north windshield wall. the walls of the holes can be built with bricks or ceramic pipes, and fish can hide in the shelter when the cold wave strikes. (4) if frostbite of fish is found, apply 4/10000 concentration of salt and baking soda mixture as soon as possible to prevent the occurrence of water mildew.