The following preparations must be made for crayfish farming:

First, choose a pond. The water source requires fresh water, sufficient dissolved oxygen, and no pollution.

Second, pond cleaning and disinfection

Pond cleaning and disinfection can effectively kill harmful organisms in the pond (catfish, loaches, snakeheads, snakes, rats, etc.) and compete with them for food. wild fish (carp, crucian carp, etc.), and pathogens. Quicklime and bleaching powder can be used, which is economical, affordable and safe.

The third thing is to plant aquatic plants

"The quality of lobster depends on whether there is grass in the pond. Whether the lobster is big or not depends on the grass in the pond."

The fourth thing is shrimp. Pond fertilization

Life habits of crayfish

(1) Survival water body and water quality requirements

Crayfish have strong adaptability , Judging from the investigation, lobsters can survive in lakes, rivers, ponds, ditches, and paddy fields, and can even survive in some water bodies where it is difficult for fish to survive. Lobsters have strong adaptability to D.O. in water bodies, and can survive in hypoxic environments in the water. Not only can it climb ashore, but it can also rely on floating plants or aquatic plants in the water to lie on its side on the water and use the gills on one side of its body to breathe to survive. In order to determine the critical value of lobsters to water dissolved oxygen, we conducted experiments in a water cluster box in the laboratory. The water cluster box of 40cm×60cm was placed at a depth of 25cM. There were no floating objects in the water that lobsters could attach to. After placing the lobsters, they were gradually consumed. Dissolved oxygen in the water body. When the death rate due to hypoxia in the water cluster box reaches 73%, the D.O in the water is measured to be 0.67mg/L.

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(2) Food habits

The food habits of lobsters are very mixed, including all kinds of fresh aquatic plants, benthic organisms in the water body, etc. Animals, molluscs, large zooplankton and the carcasses of various fish and shrimps are all lobsters' favorite food. They also like artificially fed feed. During the peak growing season, there are many downwind areas of the pond?

On the water surface, it can be observed that the lobster places its mouthparts on the horizontal surface and uses its two large claws to continuously paddle the water surface algae into the mouth, indicating that the crayfish can even use algae in the water.

? (3) Reproduction

The mating season of lobster is generally from late April to July, and the peak period of group mating is in May. The female shrimp lies on her back on the bottom of the water, and the male shrimp clamps the front pincers of the female shrimp on top of it, hugs the female shrimp with its walking legs, and inserts its connector into the female body. The mating time is 10-30 minutes. We first observed egg-robbing shrimp in experiments and on the market on May 28 and June 4. After August, the female shrimp group began to lay eggs in large numbers, and after September, juvenile shrimp hatched. After hatching, the juvenile shrimps are all attached to the swimming legs of the mother's abdomen and complete the growth and development process of the larval stage under the protection of the mother. In the lobster breeding area, we dug holes and took samples three times in September, November and December. We found that there were lobster larvae growing to different stages on the swimming legs of the mother's abdomen. The largest lobster larvae was 1.0-1.1cm long. It can be inferred that , after the lobster juveniles hatch in the early autumn of the first year, the growth, development and overwintering process of the lobster larvae are all attached to the mother's abdomen, and they do not leave the mother's body until the second spring. Crayfish's method of breeding offspring is , ensuring a high survival rate for offspring.

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(4) Burrowing habits

1. Burrowing depth and speed

Lobster The depth of the caves ranges from 50 to 80cm, with some exceeding 1m. Generally, lobster caves running horizontally can exceed 1m, while caves with vertical depth are generally shallower. Lobsters dig holes very quickly in their new living environment. They can dig holes in the sand all day and night. The depth of new holes dug in poor soil exceeds 30cm. The depth of digging is the key to determining the degree of harm.

2. Location of lobster caves

The cave entrance is most 20cm above and below the water surface. There are caves at the bottom of the water pond ridge, water slopes and shallow water areas. , so the location selection is not strict.

3. The impact of living environment on lobster burrowing

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The influence of water bottom conditions on lobster burrowing is relatively small Obviously, in sandy soil with a lack of organic matter at the bottom, lobsters make more holes, while in hard soil, there are fewer holes. Under conditions where the water quality is fertile, the bottom silt is more, and the organic matter is rich, the number of holes is significantly reduced. However, no matter what living environment they live in, the number of lobster burrows increases significantly during the breeding season.