1. High-backed crucian carp. High-backed crucian carp is a dominant population developed in Dianchi Lake and its water systems in Yunnan in the mid-1970s. It has the characteristics of large individual size, fast growth, and strong fecundity. It is named after its tall back. The maximum size of an individual is 3000 grams. It is highly hydrophilic and should not be raised in mainland China. 2. Founder silver crucian carp. Founder's silver crucian carp is native to Shuangfeng Reservoir in Fangzheng County, Heilongjiang Province, and is a better species of silver crucian carp. The back of the Founder Silver Crucian Carp is black-gray, and the sides and abdomen are dark silver-white. The maximum individual weight is 1.5 kilograms, usually around 0.5 to 1 kilogram. 3. Pengze crucian carp. Pengze crucian carp is an excellent crucian carp species bred by aquatic science and technology personnel in Jiangxi Province. It has delicious meat, high meat content and rich nutrition. The body is plump, easy to transport, easy to keep temporarily, and easy to take the bait, which is conducive to the market of live fish. It is also a fish that can be developed in both production and sport fishing. 4. Qihe crucian carp. Qihe crucian carp is named after Qihe, an east-west mountainous river in northern Henan Province. The Qihe River does not freeze all year round. From January to February, the water temperature is still above 10°C, and both sides of the Qihe River bed are covered with water and grass. The excellent ecological environment creates good conditions for the growth and reproduction of Qihe crucian carp. The meat of Qihe crucian carp is tender and delicious. According to ancient books, Qihe crucian carp, along with fragrant rice and silk eggs, are the three major local tributes. In addition to the above-mentioned high-quality crucian carp with great economic value, there are also Longchi crucian carp from Liuhe County, Jiangsu Province, Hailar silver crucian carp from Hailar area in Inner Mongolia, etc. Their common characteristics are large size, tender meat, and It tastes delicious and is deeply loved by the local people. Hybrid crucian carp species 1. Heterobred silver crucian carp. It is the offspring of artificial mating with Founder silver crucian carp as the female parent and Xingguo red carp as the male parent. Allobred silver crucian carp grows 2 to 3 times faster than ordinary crucian carp. It has strong adaptability to life, few diseases, and high survival rate. It can be stocked in large water surfaces and cultured in ponds. It is a very good artificial breeding species. 2. Hybrid crucian carp. The offspring are obtained by "crossing" the Founder silver crucian carp as the female parent and the Taihu wild carp as the male parent. Trial breeding shows that it has obvious hybrid advantages, strong adaptability, fast growth, large size, wide feeding habits, few diseases, and delicious meat. It is generally welcomed by production units. It is suitable for raising in inner ponds, outer ponds, riversides and lakes. It is a new breeding species with good economic and social benefits. Introduced crucian carp species At present, the only exotic crucian carp species introduced in China is the white crucian carp, which is native to Lake Biwa in Japan and is a large crucian carp. White crucian carp has strong adaptability, can grow and reproduce in adverse environmental conditions, and has great tolerance for temperature, water quality changes, low dissolved oxygen, etc. The largest individual is about 1000 grams. There are many varieties of crucian carp currently on the market. If you need to distinguish between wild crucian carp and farmed crucian carp, you can refer to the following methods: First, look at the individual size of the fish. Generally, the size of farmed crucian carp on the market is relatively large, especially the selected and hybrid varieties, which are neater in size. Wild crucian carp is mostly caught or fished from large water bodies. They vary in size and are generally small. They are often only half the size of farmed crucian carp. Secondly, look at the size of the fish. Farmed crucian carp generally has a raised back and a wider body, while wild crucian carp has a very obvious spindle-shaped body and a smaller head. Again, you can look at the body color of the fish. The body color of farmed crucian carp is lighter, with mostly silvery white sides, while the body color of wild crucian carp is light yellow and the surface is bright. The latest crucian carp species, crucian carp Xiangyun crucian carp and Xiangyun carp, were developed by a research group headed by Academician Liu Jun of the School of Life Sciences of Hunan Normal University, using a combination of cell engineering technology and sexual hybridization, and after more than ten years of painstaking research. New type of fish with ploidy. Compared with other crucian carp and carp, Xiangyun crucian carp and Xiangyun carp have the following excellent characteristics: Gonadal sterility Xiangyun crucian carp and Xiangyun carp are new allogeneic triploid fish. They cannot breed on their own and can be grown in any freshwater fishery waters. Breeding will not cause the resources of other crucian carp and carp species to be mixed, nor will excessive reproduction lead to a decline in the quality of commercial fish. Fast growth rate. Practice shows that the growth rate of Xiangyun crucian carp is 3-5 times faster than that of ordinary crucian carp species. The maximum growth rate of fry in that year can reach 0.75kg. The growth rate of Xiangyun carp is 30-50 times faster than that of ordinary carp. The maximum growth rate of fry in that year is 0.75kg. Up to 1.7kg.

Omnivorous, strong feeding capacity, low breeding cost. Xiangyun crucian carp and Xiangyun carp are omnivorous fish. Xiangyun crucian carp also has the characteristics of filter-feeding plankton. It has a higher feed utilization rate than other carp and crucian carp species. At the same time, it has no gonads. development, so all the nutrients ingested by crucian carp are used for growth. High survival rate and strong disease resistance. The survival rate of Xiangyun carp summer flower fish species is over 90%, and the survival rate of winter flake fish species can reach over 98%. Tests have shown that Xiangyun crucian carp and Xiangyun carp have strong disease resistance, and large-scale disease infections have never been found. Tolerant to low temperature and low oxygen, Xiangyun crucian carp and Xiangyun carp generally do not cause a large number of fry to die due to "flooding of the pond", and are suitable for intensive pond culture, cage and rice field culture in high-density ponds. Xiangyun crucian carp and Xiangyun carp can feed and grow when the water temperature is above 10°C, which extends the growth period. In northern areas, they can also be grown as commercial fish in the same year. The body shape is beautiful, the meat is fresh and tender, and the nutritional value is high. The edible part of Xiangyun crucian carp and Xiangyun carp is 10-15 higher than that of ordinary crucian carp and carp. There are fewer fine spines in the muscles, and the content of flavorful amino acids in the muscles is significantly higher than that of Japanese white crucian carp and ordinary crucian carp and carp.