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Artificial Breeding of Herring
Herring is one of the unique freshwater aquaculture economic fishes in China, one of the four major fish. The research on artificial reproduction of home fish has been more than 30 years old. Artificial breeding of grass carp, carp, and carp has been widely promoted throughout the country. Due to artificial breeding of herring, there are two major problems: First, under conditions of pool culture, gonadal development is difficult to achieve sexual maturity during the reproductive season. According to domestic data reports: herring sinus oocytes appear abortion in the development process, the highest peak of the ovum mature line is 8%, generally found that male development is not good, male testis maturation coefficient of 0.2%, can not squeeze out semen during oxytocin, Compared with grass carp, the maturation coefficient of 15% and the maturation coefficient of 0.7% are very different. The most important reproductive seasonal glandular development can not reach the standard of the end of IV stage. Second, artificial breeding of herring usually rely on artificial midwifery to obtain fertilized eggs. Artificial insemination is not carried out under the condition of simultaneous development of male and female gonads, and the rate of fertilization is often low, and the goal of fertilization is sometimes not achieved. The above problems have aroused the attention of domestic fish breeding workers, and have so far failed to come up with reliable methods and information for revealing the laws. In the traditional four-major fish rearing for thousands of years, only three domestic fingerlings were provided for breeding in many places. The fish breeder breeding ground in Pingjiang County, Hunan Province has systematically studied the germ cell regulation, fertilization biology, and embryological development of herring in order to solve the above problems. He discovered the reproductive law of herring, and invented the cultivation and production methods of blue broodstock. The above two major problems have been resolved. When the herring reaches the sexual maturity age, the female reproductive development of the reproductive season can reach the mature standard. Artificial spawning females and male oestrous matings can achieve complete synchronization in spawning and fertilization, and the results have been applied in fish breeding grounds in Pingjiang County, Hunan Province. Over 40 years of bred broodstock have been bred for more than 30 million larvae. Herring fillets are sold well in Dongting Lake, Hubei Honghu Lake, and Poyang Lake in Jiangxi Province. They are very popular among breeders and are in short supply year after year.