The crustacean crawfish superfamily is divided into crayfish, river shrimp, mimicry shrimp, and langoustine shrimps. Among them, the crayfish family, river shrimp family, and mimetic river shrimp family belong to freshwater species. Freshwater crayfish have large individuals, strong adaptability, high reproduction rate, short breeding cycle, and generally short life span. For example, the life span of crayfish is 4 to 5 years. Marine crawfish are large in size, have a slow growth, and have a long breeding cycle. For example, the lifespan of crayfish in the Americas can reach 50 years. The currently cultivated crawfish are mainly crayfish. Crayfish are usually mated in the fall and fertilized and hatched in the spring and summer of the second year. The incubation period is related to the water temperature. For example, the Procambarus clarkii incubation period is from 30 days to 40 days at 18°C ​​to 20°C, and only 15 days to 20 days at 25°C. The crawfish eggs hatched directly from the crawfish larvae. The first and second stage larvae of freshwater crayfish still adhere to the maternal appendages and leave the mother's body independently after several moltings. The development of the entire larvae requires more than ten times of molting to become juveniles. The newly hatched crayfish larvae are nutritious for their own yolks. The first time they began to ingest phytoplankton and small larval larvae, rotifers, etc.; after four or five times of molting, they can ingest small horns and cockroaches. Category; larval metamorphosis end to omnivorous. Adult crayfish are spawned and eaten mainly on small crustaceans, mollusks, aquatic insect larvae, algae, fish, and organic debris. In the case of starvation, the same type of food is also eaten. Crayfish Camp benthic crawl life. It has strong adaptability and can grow and reproduce in rivers, lakes, ditches, ponds and rice fields. During the day, they sneaked into the caves. At night, they burrow for food, shells and mating. Same-sex crawfish are aggressive, so crawfish should be raised and kept at a distance from each other, so that tentacles cannot be touched. The culture technology of crayfish is not complicated and the breeding cycle is short. It can also be mixed with fish, without special feeding and special management, but also can play a role in three-dimensional utilization and improve water productivity. It has been proved that polyculture of freshwater crayfish and adult fish can increase the total pond production by more than 10%, and the profit increases by about 30%. Crawfish breeding is mainly based on pond culture: 1. Pond conditions require sufficient water, good water quality, and convenient drainage and drainage. The area is suitable from 3 mu to 5 mu, with a water depth of 0.8 to 1.2 meters. About 25% to 30% of the bottom of the pond is planted with water and grass for their habitat inhabitation. When the early plants are not grown, they can be planted with terrestrial plants and placed at 1.5 meters above the fish pond, every 3 to 5 meters. One, put 20 to 30 per mu. 2. Qingtang Fertilizer Appropriate water 0.2 to 0.3 meters in mid-April, with 8 kg to 10 kg of bleaching powder and 70 to 80 kg of quicklime diluted and diluted in Quanchipi to kill enemy pests. In mid-May, fertilizing and breeding feed organisms were used to improve the survival rate and growth rate of early crayfish rearing. 3. The stocking size of stocked shrimp depends on the stocking size and size of the mixed fishes and is flexible. For ponds that cultivate one-year old fingerlings, 10,000 to 15,000 shrimps should be stocked for each acre. Note the water temperature difference when stocking. 4. Daily management After the shrimps are stocked for one week, they must be top-dressed to cultivate plankton for feeding shrimps. From June to August, the length of the crawfish grows. Feeds should be fed adequately; after mid-September, the weight of the crawfish grows. , To increase the amount of animal feed feed. In the early stage of cultivation, appropriate amount of fresh water is added once a month. If diseases are found in the breeding process, Chinese herbal medicines are generally used to prevent diseases through soaking and bait-repelling methods, and chemical drugs are used as little as possible to avoid killing the crawfish. In early October, when the temperature drops to 18°C, fishing can begin. In addition to pond cultivation, paddy field cultivation and water channel aquaculture can also be carried out in various places based on actual water conditions. Cultured crayfish can also be developed as ornamental species in addition to being edible.
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