Crayfish Culture Technology in cement Pond

There are many ways and methods of raising lobster, as far as the editor knows: crayfish in cement pond, crayfish in rice field, crayfish in lotus root field and so on. With the continuous improvement and improvement of people's culture technology, more and more new culture techniques are constantly emerging.

Crayfish Culture Technology in cement Pond

1. Preparation of breeding ponds: build several small ponds, each with an area of about 4 square meters and a depth of 70 centimeters. Before stocking parent shrimp, each square meter breeding pond is thoroughly disinfected with about 200 grams of quicklime, and the newly built cement pond is disinfected after removing alkali first.

The water depth of the cement pool is generally maintained at 50-60 cm. Artificial nests are built with asbestos tiles and red bricks at the bottom of the pool. A sunshade cloth is built over the cement pool. Water hyacinth is raised in the pond, covering the surface of the water. Configure the corresponding oxygenation facilities.

2. parent shrimp selection: the selection of parent shrimp is generally carried out from June to August, requiring parent shrimp individuals to be more than 40 grams per tail, physically healthy, complete appendages, bright color, and no disease or injury on the body surface.

3. Parent shrimp delivery: for parent shrimp transported over a long distance, soak the parent shrimp in the pond for 3-5 minutes before stocking, and then put it on the edge of the pond for 2-3 minutes. Repeat this for 2-3 times. After allowing the parent shrimp to absorb enough water, slowly put it into the pond around the pond. There are 40 parent shrimps per square meter, with a male-to-female ratio of 1:1. At the same time, the specifications of parent shrimp should be the same.

4. parent shrimp cultivation: parent shrimp need to be strengthened before reproduction in order to supplement the nutrition of shrimp and promote gonadal development. Generally fed with high protein animal feed (such as surimi, fish offal and animal scraps), combined with plant feed (such as soybean meal, bran, etc.), the ratio of animal feed to plant feed is 1:1 or 3:2. Generally, it is fed once at about 5 pm every day, and the feeding rate is 3-5%.

5. Water quality management: the breeding pond changes water once every 3-5 days. If the water quality of the shrimp pond is poor, it is necessary to drain the pond water and clean the shrimp pond. Turn on the aerator to increase oxygen in time when the water body is anoxic.

6. Fertilization and hatching: after intensive cultivation, parent prawns mate when the water temperature is above 18 ℃ in September and lay eggs one after another in mid-October. The hatching period of fertilized eggs is 30-40 days when the water temperature is 18-20 ℃, and only 15-20 days when the water temperature is 25 ℃. When it is found that there are a large number of young shrimp in the breeding pond, seedlings should be collected in time.

7. Shrimp seedling cultivation: the collected shrimp seedlings are transported to the shrimp seedling culture pond in time. The shrimp fry culture pond is better with a cement pond with an area of 20-40 square meters and a water depth of 1 meter, or a soil pond with an area of 1-3 mu, a slope ratio of 1:2 and a water depth of 0.5-1 meter. Apply 500 kilograms of rotten human and animal dung per mu to cultivate natural feed. Put a certain number of aquatic plants (water peanut, water hyacinth, etc.) in the pond for juvenile shrimp to inhabit, molt and hide.

Choose to put juvenile shrimp in sunny morning or cloudy day, 150-230 shrimp per square meter. In the first week after stocking, soya-bean milk was fed 3-4 times a day; in the second week, animal feeds such as small fish and shrimp, snail mussel, earthworms, silkworm pupae and other animal feeds were fed, properly mixed with corn, wheat, fresh plant stems and leaves and other paste fodder, fed once in the morning and once in the evening, and 70% of the total amount in the evening. In the early stage, the daily feeding amount was 250-400 grams per 10,000 young shrimp, and then it was fed according to about 10% of the body weight of shrimp in the pond. In the process of cultivation, the water was changed once every 7-10 days, and every 15 days or so, the water was evenly sprinkled with 20 grams of quicklime in the whole pool.

After 25-30 days of cultivation, the young shrimp can reach 3 cm in length after 5-8 times of molting growth. Shrimp seedlings can be transferred to soil ponds for routine culture in April next year.

Stocking preparation of lobster

1. Clear the pond thoroughly: 20-30 days before stocking, drain the pond water, remove too much silt, renovate the ridge of the pond, use 75 kilograms of quicklime per mu or bleach powder, bleach powder and other drugs to thoroughly clean the pond for disinfection.

2. Apply sufficient basic fertilizer: 500 kilograms of rotten livestock and poultry manure per mu to cultivate rotifer, Cladocera and copepod plankton to provide palatable bait for shrimp seedlings.

3. Planting aquatic plants: verticillium verticillata, Rabdosia malayensis, Elodea and other aquatic plants are planted in the culture pond, accounting for 2% of the area of the shrimp pond. At the same time, set up nets, or set up bamboo tubes, plastic tubes, etc., to provide habitat, molting and concealment for crayfish.

Timely fishing of crayfish

1. Ground cage fishing: the lobster net is made into a ground cage. Each cage is about 5 meters long, with barbs on both sides of each grid at intervals, with a shielding net woven above the cage, and the two ends of the cage are rounded respectively. It is better to have a net in the ground cage. Put the ground cage on the edge of the shrimp pond every morning or afternoon, and put fishy fish, chicken intestines and other things as bait. In the evening, when the shrimp came out to look for food, it smelled something strange and came after it. It bumped into the cage. There was a net above the cage, so it could not climb up, so it looked around for the entrance and got into the cage. The shrimp in the cage slides deep into the cage and becomes the shrimp in the cage. This fishing method is suitable for lobster fishing in deep ponds.

2. Hand-copied net fishing: put the shrimp net into a square above, leaving a cone-shaped funnel with inverted thorns below, driving continuously with poles along the edge of the shrimp pond or where the grass grows, the shrimp enters the square net, picks up the net, and the shrimp is caught. This fishing method is suitable to be used in places where shrimp are dense.

3. Dry pond capture: drain the water from the pond, and the shrimp will appear at the bottom of the pond and be picked up by hand to catch as much as you can.

What are the advantages of raising crayfish?

1. Great market potential: the market demand for crayfish is very large. This tight relationship between market supply and demand makes the crayfish industry have high economic benefits and broad development prospects, and the market is not a problem.

2. The difficulty of culture is low: crayfish has strong adaptability to environment, less disease and tolerance to hypoxia. Crayfish can not only culture in small water bodies with high density in ponds, but also proliferate naturally in many kinds of water bodies such as river ditches, lakes, rice fields, marshes and so on. The culture technology is simple.

3. Low culture cost: the feeding habits of crayfish are miscellaneous, the bait is easy to solve, there is no need to feed special feed in low density culture, the growth speed is fast, the yield is high, the energy conversion rate is high, the culture cost is low, and the benefit is good.

4. The culture cycle is short: crayfish can be put on the market after about 2 months of culture, and the technical scheme of catching the big and leaving the small can adopt the way of circular culture, which belongs to the culture mode of one-time and perennial benefit.

Crayfish now in the market is very good, especially in the midnight snack industry, crayfish is very popular. We all know that nowadays, especially some young people, they all like to go out in the evening, and it is very pleasant to have dinner with three or five friends in the evening and talk about life.