Culture technique of hairy crab

Hairy crab is a kind of river crab, which is widely distributed along the long coastline from Liaohe River in the north to Pearl River in China. Among them, the Yangtze River system has the largest output, the most delicious taste and rich nutrition. Generally speaking, hairy crabs refer to the Yangtze River system of Chinese mitten crabs. Breeding hairy crabs has less investment and high benefit, which is a good way to get rich.

1. Preparation for seedling casting

Use a pulling net to stop escape, sterilize and disinfect the pond, remove excessive sludge, leaving only about 10 cm of sludge, sprinkle the whole pond with quicklime, the dosage per mu is 200-250 kg, so as to achieve the purpose of thorough pond cleaning and disinfection, impurity removal, killing bacteria and improving substrate quality. 7 days after the drug, that is, water once to remove dirt, and then sun pond 3-5 days after adding water.

Plant good aquatic plants

Breeding hairy crabs, first of all to plant good water grass, water grass is one of the natural bait of hairy crabs, and can play a good role in purifying water quality, but also hairy crabs habitat, avoid enemy places. Mainly algae. You can also add a suitable amount of snails. For more water plant planting, please read the article "Crab Pond Water Plant Planting and Conservation Technology".

rational stocking

Before putting, the crab seedlings should be disinfected and evenly separated according to their size. When putting, they should be put into the water area with purse seine. The purse seine can only be removed after one month for crabs to adapt to the environment. General crab breeding to achieve "three appropriate","a temporary breeding" principle. That is, appropriate density, timely stocking, moderate specifications and first temporary stocking. When stocking, the water should not be too deep, preferably 1.5-2 meters; the temperature is most suitable at 20-25 degrees.

stocking density

Under the environment of abundant water plants and fresh water quality, the general specification is about 300 per mu, so that hairy crabs have sufficient living and growing space. The stocking time of crab species is generally from the end of February to March of each year. If the species are released too early, the winter casualties will be heavier. If the water temperature rises too late, some crabs will molt, which will affect the survival rate of the lower pond.

Daily inspection of the pond

In the morning, the pond patrol is mainly to check whether there is residual bait, so as to arrange the bait of the day; at noon, the pond patrol is mainly to measure the water temperature, observe the water color condition and the change of the pool water; in the evening and at night, the pond patrol is mainly to observe the activity and feeding situation of the crab, and timely take measures when problems are found.

precautions

From October onwards, the remaining crabs can be caught at night according to the characteristics of mature crabs landing one after another. The crab caught should be washed clean with water in time and put into the temporary incubation box for more than 2 hours, so that it can clear the gills by itself to prevent suffocation and death.