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Reproduce 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, tender, and high in dissolved oxygen with a transparency of 40 cm or more. One is to deepen the water level and keep the normal water level of the pond at 1.5 meters. The pond water depth of farmed Liao crab must be more than 2 meters to avoid burning the crab body. The second is the high temperature season. Change the water every 3-4 days. Change the water volume every time by 30-40 centimeters. It is better to place side-by-side injections to make the pool be microfluidic. When changing the water, the water level should be kept stable. In case of bad weather, when the water quality changes, the water exchange volume must be increased. The pool water should be filled as much as possible. The water residue should be removed before changing the water to avoid water pollution. If the number of crawling crabs on the shore is found to increase, the amount of foam in the mouth is an anoxic phenomenon, and the water should be changed immediately and the amount of water changed. Third, every 7 days -10 days, a lime of 15 kg will be splashed, which will clarify the water quality and increase the effect of non-calcium.
In the summer months, investment should be carried out every morning and evening. The amount of daily feeding is about 10% of the body weight of the crab, and the second is the slightest surplus. Among them, the amount of feeding at 5 o'clock in the afternoon is 70% of the amount of bait throughout the day, and it is necessary to remove the residual baits that cannot be eaten in time so as to avoid damaging the water quality. Animal and vegetable foods should be properly matched. Among them, plant foods account for about 60%. Can also feed the whole crab pellet food. When baiting, depending on the situation of the day, the water quality, crab feeding activities, etc. are flexible. The feed should be placed in shallow water areas with grass and the distribution should be uniform.
Attention should be paid to the high-temperature season of disease prevention. There are many pathogenic factors and it is easy to cause all kinds of river crab diseases, especially the outbreak. Therefore, we must adhere to the principle of prevention and treatment in the whole breeding process. May regularly alternately spill 1ppm oxytetracycline powder, 0.5-1pmm zinc sulfate, 0.5pmm crab aling and other drugs; often feeding baits, reuse 0.1-0.2 grams of oxytetracycline or erythromycin every 1000 grams of crab bait feeding . Add appropriate amount of shell powder, bone meal, fish meal, poultry eggshell powder, and capsin to the feed to increase calcium, iron and other elements in the feed to facilitate shelling. Parasitic disease can be spilled with 5-10 ppm formalin or other insecticides in the whole pool. Bacterial disease can be disinfected with water for 2-3 times. The combination of Quanchiposa drugs and feeding baits is better.
Crab Management Techniques in Summer Ponds
Transplanting aquatic grass crab ponds to transplant Elodea, Hyacinth, Vallisneria, Hydrilla verticillata and other aquatic plants, covering about 50%. Aquatic grass is not only a favorite plant feed for crabs, but also provides a shelter and a substrate for attached organisms. For rotten plants, remove them in time to avoid damaging the water quality. When grass is insufficient, it must be replenished promptly.