CATDOLL : CATDOLL: Can crayfish be farmed in the north?

Can crayfish be farmed in the north?

Crayfish can be farmed in the north. Lobsters have a wide adaptability and strong reproductive capacity. They can be farmed in rivers, lakes, ponds or rice fields. Among them, pond farming is an important form of lobster farming because it is easy to raise and manage, has a wide source of feed and high yield. Lobsters have a wide adaptability and a wide range of suitable growth temperatures. They can grow and develop normally when the water temperature is 10-30℃. They can also withstand high temperatures and severe cold, can withstand high temperatures above 40℃, and can safely overwinter when the temperature is below -14℃. Crayfish grow rapidly. Under suitable temperatures and sufficient bait supply, they can reach sexual maturity and commercial shrimp specifications after more than 2 months of farming. Generally, male shrimps grow faster than female shrimps, and the commercial shrimp specifications are also larger than female shrimps. They like to dig holes during the breeding season. The cave is located about 20 cm above the water surface of the pond, with a depth of 60 cm to 1.2 meters. There is a small amount of accumulated water inside to maintain humidity. The cave entrance is generally sealed with a mud cap to reduce water loss. In the summer nights or after heavy rains, it has the habit of climbing ashore, crossing the dam and entering other water bodies. Crayfish are omnivores. In terms of eating habits, crayfish prefer to eat mud at the bottom of the river, and like to eat dead small fish or other aquatic organisms. It mainly eats plants, and small fish, shrimps, plankton, benthic organisms, and algae can all be used as its food. The astaxanthin content of the body is positively correlated with its ability to resist the harsh external environment. In other words, the higher the astaxanthin content of the body, the stronger its ability to resist the harsh external environment.

Crayfish can be farmed in the north. Lobsters have a wide adaptability and strong reproductive capacity. They can be farmed in rivers, lakes, ponds or rice fields. Among them, pond farming is an important form of lobster farming because it is easy to raise and manage, has a wide source of feed and high yield. Lobsters have a wide adaptability and a wide range of suitable growth temperatures. They can grow and develop normally when the water temperature is 10-30℃. They can also withstand high temperatures and severe cold, can withstand high temperatures above 40℃, and can safely overwinter when the temperature is below -14℃. Crayfish grow rapidly. Under suitable temperatures and sufficient bait supply, they can reach sexual maturity and commercial shrimp specifications after more than 2 months of farming. Generally, male shrimps grow faster than female shrimps, and the commercial shrimp specifications are also larger than female shrimps. They like to dig holes during the breeding season. The cave is located about 20 cm above the water surface of the pond, with a depth of 60 cm to 1.2 meters. There is a small amount of accumulated water inside to maintain humidity. The cave entrance is generally sealed with a mud cap to reduce water loss. In the summer nights or after heavy rains, it has the habit of climbing ashore, crossing the dam and entering other water bodies. Crayfish are omnivores. In terms of eating habits, crayfish prefer to eat mud at the bottom of the river, and like to eat dead small fish or other aquatic organisms. It mainly eats plants, and small fish, shrimps, plankton, benthic organisms, and algae can all be used as its food. The astaxanthin content of the body is positively correlated with its ability to resist the harsh external environment. In other words, the higher the astaxanthin content of the body, the stronger its ability to resist the harsh external environment.

Generally speaking, the climate environment in the north can raise crayfish. Crayfish are extremely adaptable and have a wide range of suitable growth temperatures. They can grow and develop normally when the water temperature is 10-30℃. They can also withstand high temperatures and severe cold, can withstand high temperatures above 40℃, and can safely overwinter when the temperature is below -14℃. In the winter in the north, the temperature in the north comes more than a month later and goes more than a month earlier. It is not as good to raise crayfish in the open air as in the south. It is recommended to raise them in greenhouses or greenhouses, and arrange heating coils or similar heating devices. Of course, the cost of such breeding is much higher than that in the south. Generally, the crayfish pond should be rectangular, with no limit on area, and easy to manage. The north is sandy, so as long as it can be watered in and drained. The pond can be surrounded by asbestos tiles, plastic films, etc., and buried about 30 cm below the horizontal plane to prevent crayfish from burrowing and escaping.

Crayfish can be farmed in the north. Lobsters have a wide adaptability and strong reproductive capacity. They can be farmed in rivers, lakes, ponds or rice fields. Among them, pond farming is an important form of lobster farming because it is easy to raise and manage, has a wide source of feed and high yield. Lobsters have a wide adaptability and a wide range of suitable growth temperatures. They can grow and develop normally when the water temperature is 10-30℃. They can also withstand high temperatures and severe cold, can withstand high temperatures above 40℃, and can safely overwinter when the temperature is below -14℃. Crayfish grow rapidly. Under suitable temperatures and sufficient bait supply, they can reach sexual maturity and commercial shrimp specifications after more than 2 months of farming. Generally, male shrimps grow faster than female shrimps, and the commercial shrimp specifications are also larger than female shrimps. They like to dig holes during the breeding season. The cave is located about 20 cm above the water surface of the pond, with a depth of 60 cm to 1.2 meters. There is a small amount of accumulated water inside to maintain humidity. The cave entrance is generally sealed with a mud cap to reduce water loss. In the summer nights or after heavy rains, it has the habit of climbing ashore, crossing the dam and entering other water bodies. Crayfish are omnivores. In terms of eating habits, crayfish prefer to eat mud at the bottom of the river, and like to eat dead small fish or other aquatic organisms. It mainly eats plants, and small fish, shrimps, plankton, benthic organisms, and algae can all be used as its food. The astaxanthin content of the body is positively correlated with its ability to resist the harsh external environment. In other words, the higher the astaxanthin content of the body, the stronger its ability to resist the harsh external environment.

How to raise crayfish? Is it suitable for breeding in the south?

Pond culture of Procambarus clarkii, or crayfish, is easy to raise and manage, has a wide source of feed, and has high yields. It is an important form of Procambarus clarkii culture. 1. The area of ​​the pond should be 4 to 10 mu, 1 to 1.5 meters deep, and the slope ratio should be 1:2.5. The bottom of the pond is flat, loam is preferred, the slope of the pond is hard, the pond has good water retention, and the water level is easy to control. The water source is sufficient and the water quality is pollution-free. According to the pattern of high irrigation and low drainage, the water inlet and outlet channels should be built to ensure that the water can be filled in and discharged. Procambarus clarkii has a strong ability to escape, and anti-escape facilities must be well constructed. Plastic film or calcium plastic board is usually used, and bamboo stakes or wooden stakes are used to support and enclose the pond to prevent escape. 2. Preparation before stocking 1. Thoroughly clean and disinfect the pond 20 to 30 days before the shrimp seedlings are stocked, drain the pond water, remove excessive silt, repair the pond embankment, and use 75 kg of quicklime or bleaching powder, bleaching powder and other drugs per mu to thoroughly clean and disinfect the pond. 2. Apply sufficient basal fertilizer. Apply 500-600 kg of decomposed livestock and poultry manure per mu to cultivate rotifers, cladocerans and copepods to provide palatable food for shrimp fry and shrimp seeds. 3. Plant aquatic plants. Plant aquatic plants such as Hydrilla verticillata, Potamogeton edulis and Elodea in the pond, with the area accounting for 2/3 of the shrimp pond area. At the same time, set up nets, bamboo tubes, plastic tubes, etc. to provide habitats, molting and hiding places for Procambarus clarkii. III. Stocking of shrimp fry and shrimp seeds 1. Farming mode A variety of farming modes can be adopted. (1) Summer stocking mode. The first batch of shrimp hatched in the current year is mainly stocked. The stocking time is mid-to-late July. The size of the shrimp is more than 0.8 cm. 30,000-40,000 shrimp are stocked per mu. (2) Autumn stocking mode. The large-sized shrimp fry or shrimp seeds cultivated in the current year are mainly stocked. The stocking time is mid-August to September. For shrimp fry of about 1.2 cm in size, 25,000 to 30,000 shrimps are stocked per mu; for shrimp seedlings of 2.5 to 3 cm in size, 15,000 to 20,000 shrimps are stocked per mu. A small number of shrimps will reach the market size by the end of the year, while most of them will be caught and put on the market in June or July of the following year. The weight of commercial shrimps is 25 grams, and the yield per mu is 300 to 500 kg. (3) Winter and spring stocking mode. Generally, the shrimps are stocked in December or March or April of the following year. The main purpose is to stock shrimps that do not meet the market size in the current year, with a size of 100 to 200 shrimps per kilogram, and 15,000 to 20,000 shrimps are stocked per mu. After winter and spring breeding, the shrimps can be caught and put on the market in June or July. The weight of commercial shrimps can reach 30 grams, and the yield per mu is 400 to 500 kg. 2. Seedling quality The quality requirements of shrimp fry and shrimp seedlings are: (1) Uniform size. The size of juvenile shrimps is above 0.8 cm, and the size of shrimp seedlings is about 3 cm. The size of shrimp fry and shrimp seedlings stocked in the same pond should be consistent, and they should be stocked at one time. (2) Strong physique, complete appendages, free of disease and injury, strong vitality. (3) Shrimp seedlings and shrimps are all artificially cultivated. If they are wild shrimps, they should be domesticated for a period of time before being released to avoid fighting and killing each other. 3. Precautions: (1) In winter, stocking should be carried out on a sunny morning, and in summer and autumn, stocking should be carried out on a sunny morning or on a rainy day to avoid exposure to the sun. (2) Before stocking, the shrimps should be bathed in 3% to 5% salt water for 10 minutes to kill parasites and pathogens. (3) Shrimp seeds purchased from other places should be slightly processed before stocking because they have been out of water for a long time. Soak the shrimp seeds in the pond water for 1 minute, lift them up and set them aside for 2 to 3 minutes, and then soak them for 1 minute. Repeat this 2 to 3 times to allow the shrimps to absorb enough water on their body surface and gill cavity before stocking to improve the survival rate. (4) In ponds where crayfish are raised, some silver carp and bighead carp should be mixed appropriately to improve water quality and make full use of bait resources. 4. Scientific feeding Crayfish have a mixed diet and are quite greedy. In feeding, the following three points should be grasped. 1. According to the nutritional needs of Crayfish at the same growth and development stage, make a good combination of feed and feeding. In the juvenile and young shrimp stages, Crayfish feed on rotifers, cladocerans, copepods and aquatic insect larvae, while in the adult shrimp stage, they feed on animal feed and plant feed. After the shrimp fry and shrimp seeds are released, fertilizers should be applied in time to improve the water quality. In the rapid growth stage of Crayfish from August to October, feed more bran, bean cakes and green feed, and feed animal feed appropriately. In November and December, before Crayfish hibernates, feed mainly animal feed. 2. Feed according to the living habits and feeding characteristics of Crayfish. Crayfish mostly move around at night to find food, and have the habit of competing for food and being greedy. Feeding should be done once in the morning and afternoon every day, with the afternoon being the main feeding amount, accounting for 70% of the total daily feeding amount; adopt a fixed-quality, quantitative and regular feeding method, feed enough and evenly, ensure that every shrimp is full, and avoid competing for food. 3. Feed reasonably according to the weather, water quality changes and shrimp activity and feeding conditions. The suitable water temperature for the growth of Crayfish is 20-32℃. From August to October, Crayfish has a large food intake. The daily feeding amount can be arranged at 6%-10% of the body weight of the shrimp in the pond. Dry feed or compound feed is coordinated at 2%-4%, and it can be appropriately increased or decreased according to the weather, water quality conditions and shrimp activity and foraging conditions. In continuous rainy weather or when the water quality is too concentrated, you can feed less, and feed more appropriately when the weather is fine; feed less when a large number of shrimps molt, and feed more after molting; feed less during the shrimp disease season, and feed more when the growth is normal. It is necessary to let the shrimp eat well and reduce waste and improve feed utilization. V. Daily Management 1. Establish a patrol inspection system. Patrol the pond every day and take timely countermeasures when abnormalities are found. 2. Regulate water quality. Keep the dissolved oxygen content in the shrimp pond above 5 g/L, pH value 7-8.5, and transparency about 40 cm. Change the water every 15-20 days, and change 1/3 of the water each time. Sprinkle quicklime water every 20 days, and use 10 kg of quicklime per mu each time. Keep the water level stable and not fluctuate. 3. Strengthen the management of habitats and molting sites. There are always more aquatic plants in the shrimp pond. It is strictly forbidden to interfere when a large number of shrimps molt. After molting, immediately add high-quality and palatable feed to prevent mutual killing and promote growth. 4. Prevent escape and disease. Strengthen inspections during the flood season to prevent shrimps from escaping. Do a good job in disease prevention and pest removal. VI. Commercial shrimp fishing and transportation 1. Fishing. It can be concentrated in June-July and November-December. First use ground trap nets, hand nets and other tools to catch, and finally use dry ponds to catch. You can also catch the big ones and leave the small ones, and fish all year round.