Prevention and treatment of acute poisoning of river crab cultured in river crab

There are two symptoms of acute poisoning of river crab:

1) toxic factors, because of the strong invasion, in a relatively short time, through the Gill and triangular membrane of the river crab, the posterior edge of the back nail of the river crab shows false "molting", or the triangular membrane is red or black mud, or the abdominal navel of the river crab is open and sagging, the limbs are stiff and die.

2) toxic factors, in a relatively short time, through the feeding of aquatic plants and artificial feed, and through the blood circulation of stomach and intestine, make the endocrine disorder of river crab, chelate foot, foot and head and chest divorce and die.

The factors that lead to the death of river crabs are inside the pond, such as hydrogen sulfide, ammonia, biological toxins in water, and so on. There are exogenous, such as too high concentration of drugs, feed infected by toxic substances, etc.

Prevention and control methods:

Before ① crab breeding, the pond was cleared with 100kg quicklime per mu after dry water in the breeding pond. From June to September, 10 kg of quicklime was used per mu every month. After dissolving water, the whole pool was sprinkled.

At the end of the year of ②, remove excessive silt from the bottom of the pond (keep 5cm).

③ planted grass and water plants in the pond to purify the water quality.

Once there is a disease in ④, replace it with new water immediately.