Tilapia? [luó fēi yú]: It is a group of small and medium-sized fish. Its shape and individual size are similar to those of crucian carp, and its fins are as delicate as mandarin fish. The main cultured species in China are Nile tilapia, tilapia and tilapia. Oreochromis aurea? Hybrid offspring of Mozambican tilapia and various combinations.
Nile tilapia: native to East Africa, Jordan and other places. The edge of dorsal fin is black; The caudal fin has obvious black stripes all its life and is vertical; The throat and chest are white, the tail fin end does not reach the starting point of the gluteal fin, there are 8 ~ 10 horizontal stripes on the body side, and there is a black spot on the rear edge of the tail stalk; The height of the tailstock is greater than the length of the tailstock. Nile tilapia has the advantages of fast growth, miscellaneous eating habits, hypoxia tolerance, large size, high yield and high fatness, and can be raised alone or used as a hybrid parent fish in many areas of China.
Oreochromis aurea: It is native to the lower Nile in West Africa and Israel. Silver gray in throat and chest; The dorsal fin and anal fin have tilapia dark twill; The caudal fin is round with silver-gray spots. Compared with Nile tilapia, Oreochromis aurea is cold-tolerant, salt-tolerant and anoxic, and its fishing rate is higher. In particular, their sex chromosomes are ZW type, which can produce all-male tilapia by crossing with Nile tilapia, so they are often used as male parents of crossing with Nile tilapia.
Mozambican tilapia: It is native to Natal, Mozambique and other places in Africa. The difference between it and Nile tilapia is that the black stripes on the tail fin of tilapia are not vertical; The head and back are concave in shape; Dark brown throat and chest; The edge of dorsal fin is red, and the end of ventral fin can reach the starting point of gluteal fin; The height of the tailstock is approximately equal to the length of the tailstock. Due to the neglect of purification and breeding in the introduction process, the species degenerated and only served as the female parent of the hybrid fish of Fushou fish.
Carassius auratus [Jiyú]: Carassius auratus, commonly known as Carassius auratus, Carassius auratus, Carassius auratus, Carassius auratus, Carassius auratus and Carassius auratus, is a common freshwater fish in Europe and Asia, and is one of the fishes of the genus Carassius. After artificial propagation and breeding, crucian carp can produce many new varieties, such as goldfish, which is an ornamental fish, and its scientific name is the same as that of edible wild crucian carp. Crucian carp is mainly an omnivorous fish that feeds on plants. It likes to live in groups and chooses to eat. Common varieties are high-backed crucian carp, Fangzheng silver crucian carp, Pengze crucian carp and Qihe double-backed crucian carp.
High-backed crucian carp (Carassius auratus) is a dominant population developed in Dianchi Lake and its water system in Yunnan Province in the mid-1970s. It has the characteristics of large individual, fast growth and strong reproduction. Named for its towering back. The largest individual is 3000 grams, which is hydrophilic and not suitable for breeding in the mainland.
Founder Crucian Carp: Originated from Shuangfeng Reservoir in founder county, Heilongjiang Province, it is an excellent variety of crucian carp. Founder crucian carp has a dark gray back and a dark silvery white side and abdomen. The maximum individual weight 1.5kg is generally around 0.5 ~ 1kg.
Pengze crucian carp: It is an excellent crucian carp variety selected by aquatic science and technology personnel in Jiangxi Province, with delicious meat, high meat content and rich nutrition. Full-bodied, easy to transport, easy to raise temporarily, easy to take the bait, which is conducive to the listing of live fish, and it is also a fish that can be developed in production and fishing.
Qihe double-backed crucian carp: named after Qihe River, an east-west mountain stream in Qixian County, Hebi City, Henan Province. Qihe River is not frozen all year round. In June and February, the water temperature is still above 10℃, and the riverbed of Qihe River is overgrown with weeds. The excellent ecological environment has created favorable conditions for the growth and reproduction of crucian carp in Qihe River. Qihe crucian carp is tender and delicious. According to ancient records, Qihe crucian carp, together with seedless dates and shredded duck eggs, are the three major local tributes.