Does anyone know how crayfish are farmed?

Crayfish are highly adaptable to the environment and can grow in various water bodies such as lakes, ponds, ditches, and rice fields.

The water source should be sufficient, and the water depth should be about 1 meter. The pond must have sufficient water source, good water quality, convenient water intake and drainage, and the area is generally 3 acres and 5 acres.

The ridge of the pond should have a certain slope, and in order to avoid the escape of crayfish burrowing, the width of the ridge should be more than one meter, and the anti-escape wall or anti-escape board with a height of one meter and a smooth inner wall should be set around the ridge.

Crayfish is a freshwater economic shrimp that is popular because of its delicious meat. Because of its omnivorous nature, fast growth rate and strong adaptability, it has formed an absolute competitive advantage in the local ecological environment.

Pond preparation The pond is suitable for 8-10 acres, which requires sufficient water sources, convenient inlet and drainage, water depth, flat bottom and less silt. 10 cm of water in front of the clear pond, 100 kg of quicklime slurry per mu is used to splash the whole pool, and 30 cm of water enters after 10 days. Aquatic plants such as black algae, elophylla and aquatic flowers were planted before the shrimp seedlings were stocked, and the aquatic weeds covered area accounted for 40%-60% of the pond area.

After planting aquatic plants, apply 15 kg of phosphorus fertilizer or 150-200 kg of well-rotted organic fertilizer per mu.

Seed release requires shrimp seedlings to have a strong physique, complete appendages, no disease and no injury; The shrimp seedlings stocked in the same pond are required to be of the same size, generally stocked in December or March to April of the following year, and 50 kg of crayfish seedlings of 100-200 kg per mu are stocked.

Feed feeding adopts the method of combining plant feed and animal feed. The main plant feed is corn, wheat, bran, yam, pumpkin, etc., and the animal feed is mainly pig blood, fish intestines, small trash fish, etc. The daily feeding amount of crayfish generally accounts for 6%-7% of the total weight of the shrimp in the pond, and it is fed twice a day.

Daily management The transparency of the water body is kept at 25-30 cm, and the new water is added every 5 days in the early stage of breeding, and the water is changed once a week during the high temperature period from July to August, and the water depth is maintained by meters, and 10 kg of quicklime is applied per mu once a month to promote the growth and peeling of juvenile shrimp. Patrol the pond once a day in the morning, noon and evening to observe the eating and growth of crayfish.

Disease prevention and control adhere to the principle of "prevention first, prevention is greater than cure", in addition to the regular use of quicklime disinfection in the pond, microbial preparations should also be applied regularly according to the water quality and crayfish activities to create a good environment and maintain the normal growth of crayfish.

Catch crayfish in a timely manner according to market demand and growth specifications around June.

1. Low reproductive ability: each sexually mature female shrimp generally carries about 300 eggs, and no more than 1,000 eggs at most. Crayfish conceive eggs in the body, hold eggs and hatch in vitro, and it is difficult to breed large-scale artificial shrimp seedlings.

2. Shade-loving: Crayfish like to survive in shallow wetlands, and can be cultivated on the water surface of waste ponds, rice fields, and aquatic plants (lotus root, cress, callus white, etc.). There are tall trees around the breeding base to raise shrimp, and facilities such as shade nets need to be set up in the summer and autumn high temperature seasons.

3. Domain attack: crayfish has a strong domain behavior, a group chooses a certain area as a fixed field, and does not allow other similar species to enter, when the outer shrimp enter and meet, the two shrimp precursors are raised, and the two claws stretch forward to fight, until one retreats or loses, otherwise it will be killed or even eaten.

4. Cannibalism: Crayfish are prominent in cannibalism when the group is too large or the bait is insufficient. There will be "hard eating soft" (crayfish are most likely to be eaten within a few hours after molting and molting), "strong eating weak" (strong individuals eat weak individuals), "big eating small" (large individuals eat small individuals) and so on.

5. Digging cave dwelling: crayfish has a strong ability to dig holes, the depth of the cave is between 50 and 80 cm for adult shrimp and about 25 cm for young shrimp, and most of the crayfish burrow in the high temperature in summer and cold season in winter to avoid extreme temperatures; During the breeding period, the mating and spawning of crayfish takes place in burrows. Therefore, the cultivation of crayfish is destructive to the pond, and the pond is required to be clay or loam.

6. Escape: Crayfish are most likely to escape in unsuitable environment, insufficient bait and continuous rainy weather. Therefore, anti-escape facilities must be set up around the shrimp pond and at the inlet and outlet.

7. The life span is not long: it is generally believed that the life span of crayfish is about 18 months, and the crayfish must be listed after reaching the market specifications or spawning and breeding.

8. Molting: The growth of crayfish requires molting. Sexually mature adult shrimp generally have more than 11 molts (2 for larvae and 9 for juveniles), and the whole molting process takes 5 to 10 minutes.

9. Climbing: Crayfish have strong climbing ability, and generally cling to aquatic grasses when molting to avoid predators and the same kind; When the water quality is poor or the dissolved oxygen is insufficient, it will climb the grass head or the bank of the pond ditch. Aquatic plants are planted in breeding ponds, which can play a role in habitat, climbing, shading and concealment for crayfish.

1. The water source is sufficient, the water quality is good, the drainage and irrigation are convenient, and it is best to have a continuous pond with deep water. The pond is surrounded by asbestos tiles or calcium-plastic panels to prevent crayfish from escaping. A round large * pile can be built in the pond for crayfish to burrow, forage and perch.

Aquatic plants (Elophylla, Melanophyllum rotifolia, etc.) are planted horizontally in the water, and sufficient basal fertilizer is applied.

2. The stocking seed can be juvenile shrimp or semi-finished shrimp. 30,000 juvenile shrimp per mu and 10,000 semi-finished shrimp per mu. Disinfect with 2% salt water for 2 minutes before stocking, and pay attention to operating in water, and throw lightly to avoid injury to shrimp fingerlings.

3. In the early stage, juvenile shrimp will feed on plankton in the pond, and gradually feed green feed (vegetable leaves, corn, soybean meal, pumpkin leaves, etc.) and animal bait (snails, earthworms, trash fish meat, animal liver, etc.) when their growth and development are accelerated. Feed at 7-9 o'clock in the morning and 5-8 o'clock in the evening every day, so as to achieve a timely, quantitative and fixed point, and adjust the feeding amount according to the temperature and feeding situation.

4. Pay attention to daily management to patrol the pond, monitor water quality, dirt, and prevent enemies.

1. To raise crayfish, we must first see whether the local environment is suitable for the growth of crayfish. If it is close to cold areas such as Heilongjiang, it is not recommended to do crayfish farming, which will affect its reproduction and survival.

2. If the environment is suitable, you can prepare a piece of land and pond for aquaculture. The area should not be too small, at least 2 to 3 acres, and the water depth should be about one meter. The pond stalk should be ramped to prevent the crayfish from escaping.

Before putting crayfish seedlings, the bottom of the pond must be strictly disinfected to eliminate germs.

3. After disinfecting the bottom of the pond, some aquatic plants should be planted in the breeding pond, such as water hyacinth, which can effectively provide crayfish with a place to avoid natural enemies and roost.

4. After placing the shrimp seedlings, a certain amount of shrimp food should be fed every day, twice in the morning and evening, because most of the crayfish are eaten at night, and the amount of feeding at night is about twice as much as that during the day.

5. Although crayfish does not have high requirements for water quality, it is necessary to change the water frequently, and in summer, it is necessary to change the water about once a month or so.

6. Shrimp seedlings can be slaughtered and sold after three to four months. The size of the adult shrimp is more than 30 grams. There are many ways to catch fish, such as casting nets, releasing shrimp pots, etc.

1. a container. To raise crayfish, you can use plastic pots, sorting boxes, acrylic or glass fish tanks. Be careful not to lower the height of the container than the crayfish's body length to prevent it from escaping.

2. Environment. If there is a filtration system, it can be arranged to simulate the natural environment, place tree roots, bamboo tubes, etc. for climbing, and plant plants such as water hyacinth, rotiflora and black algae for it to avoid, perch, and feed, and the water depth can reach meters. If there is no filtration system, it is recommended to raise them in bare tanks and put a small number of plants.

The water depth should be 3 5 cm. When the water quality deteriorates, the water should be changed in time.

3. Quantity. Crayfish stocking density is too large to easily cause hypoxia, fighting and other phenomena, so the family breeding so adult crayfish, each square decimeter at most one. At the same time, too many males are also prone to fighting, so the ratio of females to males is 3:1.

4. Feeding. Crayfish is omnivorous, good burial not only like to eat fresh trash fish and other animal bait, but also like to eat soybeans, soybean cakes, corn, fruits and fresh aquatic plants and other plant bait, home breeding can be fed fish, snail meat, shrimp meat, watermelon, steamed bread, etc.