How to solve the problem of high ammonia nitrogen and nitrite in the early stage of crab culture

1. Start the aerator regularly or add fresh water to make the pool water have enough dissolved oxygen to promote the transformation of nitrite into nitrate, thus reducing the nitrite content in the water.

2. Plant aquatic plants to ensure the coverage rate of aquatic plants in the pond is about 50%.

3. The water quality can also be adjusted by applying microecological agents to achieve the purpose of degrading nitrite and ammonia nitrogen;

① Spraying reclaimed water in the whole pond to increase dissolved oxygen in the water;

② The whole pond is sprinkled with 30 kilograms of zeolite powder per mu, and 2 kilograms of EM bacteria from Fujian Enoch Company are added per mu per meter of water depth, or the whole pond is sown with net 1 and other bottom modification classes.

(3) Spraying high-efficiency Bacillus compound with reclaimed water in the whole pond, with the water depth of 50g per mu per meter, or the water depth of original reclaimed water EM dew per mu per meter 1kg, can have a good effect.

4. Use drugs such as secondary tannins and nitrite for prevention and control, but pay attention to water transfer after use.

River crabs are also called "crabs" and "hairy crabs". The head and chest armor formed by the combination of head and chest is square and hard. There are a pair of eyes at the front of the body and two pairs of very sharp crab teeth on the side. A pair of appendages at the front end of the crab are called claw feet, and the surface is covered with fluff; There are 4 pairs of walking feet behind the claw feet, which are flat and long; Abdominal limbs have degenerated. The sex of a river crab can be distinguished by its abdomen: the abdomen of a female crab is round, and that of a male crab is triangular.