Crayfish culture technology

In the process of cultivating crayfish, it is very important to master certain culture techniques. We all know that for many beginners, they only take a fancy to the development prospect of lobster, but there is no in-depth research on the efforts to be made in this culture.

Crayfish culture technology

I. Culture facilities

The suitable area of the pond is 410 mu, the depth is 1mm and 1.5m, and the slope ratio is 1 ∶ 2.5m. The bottom of the pond is flat, the bottom material is loam, the soil quality of the pond slope is hard, the water retention of the pond is good, and the water level is easy to be controlled. The water source is abundant and the water quality is pollution-free. According to the pattern of high irrigation and low discharge, the drainage canal should be built so that it can be irrigated and discharged. Crayfish has strong escape ability, so it is necessary to do a good job in the construction of escape prevention facilities. Usually use plastic film or calcium plastic board, around the pool ridge with bamboo piles or wooden piles to support to prevent escape.

Second, prepare before stocking

1. Thoroughly clear the pond to disinfect shrimp seedlings 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, thoroughly clear the pond for disinfection.

2. Apply sufficient basic fertilizer and apply 500,600 kg of rotten livestock and poultry manure per mu to cultivate rotifer, Cladocera and copepod plankton to provide palatable bait for shrimp seedlings.

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

The Model of Shrimp Seedling and breeding

First, a variety of aquaculture models can be adopted.

1. Summer stocking mode. In order to release the first batch of young shrimp hatched in the same year, the stocking time is in the middle and late July, and the specification of juvenile shrimp is more than 0.8 cm. Stocking 30,000 to 40,000 per mu.

2. Autumn stocking mode. It is mainly stocked with large size shrimp seedlings or shrimp species cultivated in the same year, and the stocking time is from mid-August to September. The size of shrimp fry is about 1.2cm, 25000 ~ 30,000 per mu, and 2.5cm, 15000 ~ 20000 per mu. A small number of them can reach the listing specifications by the end of the year, and most of them will be caught and listed from June to July of the following year. The commercial shrimp weighs only 25 grams and yields 300 to 500 kilograms per mu.

3. Stocking mode in winter and spring. It is usually stocked in December or March-April of the following year. The shrimp that did not meet the market specifications were mainly stocked in that year, with a specification of 100 million shrimp per kilogram and 15000 to 20, 000 shrimp per mu. After breeding in winter and spring, catching and listing from June to July, commercial shrimp can only weigh up to 30 grams and yield 400 to 500 kilograms per mu.

2. seedling quality requirements for shrimp seedling quality are as follows:

1. Neat specifications. The specification of juvenile shrimp is more than 0.8 cm, and the specification of shrimp species is about 3 cm. The specifications of shrimp seedlings raised in the same pond should be the same and should be fully released at one time.

2. Strong physique, complete appendages, no disease, no injury, strong vitality.

3. Shrimp seedlings and species are all cultivated artificially. If it is a wild shrimp species, it should be domesticated for a period of time and then released to avoid fighting and killing each other.

Matters needing attention:

1. Winter stocking should be carried out in the morning on sunny days, and sunny mornings or rainy days in summer and autumn to avoid sun exposure.

2. Shrimp species are bathed in 3%-5% salt water for 10 minutes before stocking to kill parasites and pathogenic bacteria.

3. Shrimp species purchased from other places should be treated slightly before stocking because they have been out of water for a long time. Soak the shrimp in the pond water for 1 minute, lift and set aside for 2-3 minutes, and then soak for 1 minute. Repeat for 2-3 times, let the shrimp species absorb enough water on the body surface and Gill cavity before stocking, so as to improve the survival rate.

4. In the pond where crayfish are raised, some silver carp and bighead carp are properly mixed to improve water quality and make full use of bait resources.

Scientific feeding technology

Crayfish eat miscellaneous, and more gluttonous. Feed feed, grasp the following three points.

The main results are as follows: 1. According to the nutrition needs of crayfish in the same growth stage, we should do a good job of feed combination and feeding. The juvenile and juvenile crayfish feed on rotifer, Cladocera, copepod and aquatic insect larvae, while the adult shrimp eat both animal feed and plant feed. After shrimp seedlings and shrimp species are released, fertilizers should be applied timely to improve the water quality. During the rapid growth stage of crayfish from August to October, more wheat bran, bean cake and green feed were fed, and animal feed was fed properly. From November to December, crayfish were mainly fed with animal feed before overwintering.

2. Feeding according to the living habits and feeding characteristics of crayfish. Crayfish are mostly active and foraging at night, and have the habit of fighting for food and gluttony. Feed should be fed once every morning and once in the afternoon, mainly once in the afternoon, accounting for 70% of the total daily feed; adopt qualitative, quantitative and regular feeding methods, feed well enough to ensure that each shrimp is full and avoid competing with each other.

3. Feed reasonably according to the weather, the change of water quality and the feeding condition of shrimp activities. The suitable water temperature for the growth of crayfish is 2032 ℃. The food intake of crayfish is large from August to October, and the daily feeding can be arranged as 6%-10% of the body weight of shrimp in the pond, 2%-4% as a whole for dry feed or compound feed, and increase or decrease appropriately according to the weather, water quality and shrimp activities. In continuous overcast and rainy weather or when the water quality is too strong, you can feed less and more when the weather is fine; feed less when a large number of shrimps molt and more after molting; and feed less in the onset season and more in normal growth. We should not only make the shrimp eat well, but also reduce the waste and improve the feed utilization rate.

Daily management of lobster

1. Establish the inspection system of the pool patrol. Patrol the pool every day, find abnormal and take countermeasures in time.

2. Regulate and control water quality. Keep the dissolved oxygen in the shrimp pond above 5 g / L, pH 7-8.5, and transparency about 40 cm. Change the water every 15 to 20 days, and each time the water is changed by 1 pound 3. Sprinkle quicklime water every 20 days, with 10 kg of quicklime per mu each time. Keep the water level stable, not from high to low.

3. Strengthen the management of habitat and molting place. There are always more aquatic plants in shrimp ponds. Interference is strictly prohibited when a large number of shrimps molt, and immediately after molting, they are fed with high-quality palatable feed to prevent each other from killing each other and promote growth.

4. Prevention of escape and disease. Strengthen inspection during the flood season and strictly guard against escaping shrimp. Do a good job in disease prevention and elimination.

Fishing and transportation of commercial shrimp

1. Fishing. It can be fished centrally from June to July and November to December. First use the ground cage net, handmade net and other tools to capture, and finally dry pool capture. You can also catch the big and stay small, and catch them all the year round.

2. Transportation. Commercial shrimp are usually shipped in styrofoam boxes, can also be shipped in plastic bags, or in refrigerated trucks. Keep the shrimp moist during transportation and do not squeeze to improve the survival rate of transportation.

Through the introduction of the above editor, we must have a general understanding of lobster farming. I hope these can help new breeding friends, but the editor suggests that the best way to learn is to communicate and study with winners.