Pond rearing Panjin crabs

In summer, the feed should be fed every day sooner or later. The daily feed amount is about 10% of the body weight of the crabs, and there is a slight surplus on the second day. 50% of the feeding amount is 70% of the total feeding amount in the afternoon, and the uncompleted residue should be removed in time to avoid damaging the water quality. The feed must be fresh, palatable, and not rot. Animal and vegetable feed should be properly matched. Animal feeds include small trash fish, shrimp, snails, cockroaches, animal organs, aquatic insects, cocoons, etc.; plant feeds include wheat, bean cakes, fruits, vegetables, aquatic plants, etc. Among them, plant feeds account for about 60%. Feed should be made into a lump or block to increase utilization. Can also feed the full price of crab pellets, feeding amount should be depending on the weather, water quality, river crabs to eat and eat a flexible grasp. The feed to be placed should be placed in a shallow water area with plants and the distribution should be uniform.

Pay attention to the high temperature season, there are many pathogenic factors, and it is easy to cause all kinds of river crab diseases, especially fulminant diseases. Therefore, in the entire breeding process, we must adhere to the principle of prevention and treatment, supplemented by drugs to prevent diseases. The oxytetracycline solution of 110-6, the furazolidone solution of 0.510-6 to 110-6, the zinc sulfate solution of 110-6 to 210-6, the crab spirit of 0.510-6, etc. may be periodically sprinkling alternately; , Each 1000 grams of crabs with 0.1 ~ 0.2 grams of oxytetracycline or erythromycin spices feed; in the material to add the right amount of shell powder, bone meal, fish meal, poultry eggshell powder, in order to facilitate crab shelling. Found the disease, the right medicine. Prevention of parasites can be carried out with 510-6 to 1010-6 formalin or other insecticides in the whole pool to prevent bacterial diseases Disinfect the body with water for 2 or 3 times, splashing the drug with the bait. Combined, the effect is better.

Transplantation of aquatic weeds Plants such as Elodea, Aqueous peanut, Vallisneria, Hymenocallis, etc. are transplanted in crab ponds, and the coverage rate should be about 50%, so that the crabs will grow in the water bodies of multiple aquatic plants, which are close to natural ecological conditions. Waterweeds are not only the favorite botanical feed for crabs, but also provide shelter for river crabs. At the same time, they also absorb excess organic matter in water bodies, reduce the water's fatness, clarify water quality, enhance photosynthesis, increase dissolved oxygen in water, and absorb the sun during hot seasons. Heat energy, lower water bottom temperature, improved water environment and other important functions. The rotten plants should be removed in time to avoid damaging the water quality. When the aquatic plants are insufficient, they must be promptly replenished.

Adjusting Water Quality In summer, the water temperature is high and the water quality is easily corrupted. Water quality management should be strengthened to keep the water quality live, cool and tender. The dissolved oxygen content is high, and the transparency is more than 40 cm. One is to deepen the water level and keep the normal water level of the pond at 1.5 meters. The second is to change the water once every 3 to 4 days, each time changing the water depth of 30 to 40 cm, it is best to line the edge of the side, so that the pool of water was micro-flow state. When changing the water, the water level should be kept stable. When bad weather and water quality change, increase the water exchange. Before changing the water, remove the residue from the pool to avoid water pollution. If it is found that the number of crabs crawling on the shore, the number of them, and the spit foam are mostly lack of oxygen, change the water immediately and increase the amount of water exchange. The third is every 7 to 10 days, 15 kg of lime per acre, after the slurry Quanchiposa, there is clarification of water quality, increase the role of water body calcium.

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