I. Characteristics of the species The barbed fish and barnacles belong to the genus Oxymorpha, Acipenseridae, Tetrigoidea, and Barb, and are distributed in various river systems south of the Yangtze River. It is a large-scale, high-quality economic fish in China's rivers. Its beautiful appearance, bright body color, good meat quality, and delicious taste make it a medium-top edible fish while also serving as a good ornamental fish.
Barbed fish diet is mainly herbivorous and eats other omnivorous fish. The main foods are aquatic plants, organic detritus, etc. They also like to eat artificially-fed vegetables, bran, rice bran, peanut bran, artificial compound feed, etc., indicating that their diet is mixed and extensive, and their adaptability is strong. The barbed fish and barrams grow fast. Under better culture conditions, the annual growth (referred to as winter seedlings) is more than 750 grams.
Barbed fish sex mature age to be further confirmed, I use the broodstock body weight is generally more than 2 kilograms, artificial reproduction test results show that: mature eggs with weak viscosity, golden yellow, non-absorbed egg diameter of about 2 mm, water swelling to the maximum The egg diameter is about 35 mm.
Second, artificial propagation 1, the source of broodstock and cultivation (1) broachstock source: The broodstock used in this pilot project is a natural seedlings, fished back into the pond artificially domesticated for many years or more, to take artificial intensive cultivation.
(2) Breeding of broodstock: Broodstock are bred in ponds of approximately 3 acres each, either in monoculture ponds or in mixed ponds cultivated in ponds where the main four fishes are raised. From 1997 to 1998, exploratory domestication was adopted. , Normal breeding and cultivation. Since 1999, the broodstock has been intensively cultivated. In addition to the general feed, young leafy vegetables, peanut bran, grain buds, corn shoots, bean sprouts and other feeds have been fed, and water quality management such as replacement of water has been strengthened. 2 , Oxygen production In the South China Normal University Institute of biology fish Professor Chen Xiang? Under the guidance of the site, using conventional oxytocic agents (such as LRH-A, PG, HCG, DOM) oxytocin, oxytocin injection once Or two injection methods, the male fish dose is half of the female parent fish, the effect time is 10-12 hours, the appropriate water temperature for oxytocin production is 23-28°C, the barbed fish bark has the spawning habit in batches, and it is estimated that the broodstock after spawning After culturing for about 2-3 months, a second artificial breeding can be performed.
3, artificial insemination in the estrus estrus, timely collection of broodstock check, when the light pressure abdominal granules outflow smooth and golden luster, can be artificial insemination.
4. The fertilized eggs of the barbed spiny barbarians were weakly viscous. In order to facilitate the observation and elimination of dead eggs and dead seedlings, the authors used the two methods of still water (filling oxygen with large bowls) and microfluidic water for both of them. Between 24-28°C, the time from fertilization to filming took 48-52 hours, and the time before and after the release of the same batch of fertilized eggs could differ by more than 4 hours. The hatching rate was generally over 80%.
5, when the larvae have just emerged from the film, the total length is about 85 mm, and the activity is less. They often lie on the bottom and occasionally make up and down movements. At this time, the larvae have large yolk sac and are in the endogenous nutrition period, and do not need to feed. . Four days after the film appeared, the larvae appeared to swim flat. The yolk sac consumed more than half of the vegetative period, and a small amount of pig blood or plankton could be fed. About 7 days after filming, the yolk sac disappears as an exogenous vegetative period. At this time, a sufficient amount of food should be fed. After a few days (10 to 12 days), the ability to wait for activity will increase, and the yolk sac will move into a larger, disinfected earthen pond. Nurture.
Third, adult fish breeding According to Yangcheng Town, Yangcheng County Leigongkeng Village and Shichun Town Huangchuntan Village Zhangchun, etc. Three farmers ponds raising trials, in the collection of natural seedlings 10-15 cm specifications fish species, feeding should be sufficient, management should be maintained Refreshing water quality, micro-flowing water is better, under normal circumstances, after 10-18 months of breeding, weight up to 750-1000 grams, 400 kg per mu.
IV. Development Prospects 1. The breeding of barbed fish and barnacles in ponds has just started in recent years. Now, due to shortage of seedlings, prices are high. As a result, the farming profits are much higher than conventional farmed fish, and will remain for 3-5 years. With the success of artificial breeding and the popularization and promotion of farming, the price of barbed fish and fish bar will decrease. According to the analysis of the fish's succulent color and body color and its seed supply status, it can be used as a "vegetable blue-breeding" culture. Can be used for ornamental fish sales, although the promotion of breeding, barbed fish and fish into the fish price can be stabilized at about 40 yuan / kg, due to barbed fish culture requirements are not high, the cost is not, even if sold at 40 yuan / kg , 400 kilograms per mu, acres of profit can be 8,000 yuan, and barbed fish farming is suitable for most areas of China, the promotion of aquaculture economic benefits, the prospects are bright.
2. The river proliferating barbed fish formerly was an important economic fish of rivers. Due to over 10 years of extreme fisherman overcharging and water pollution, river barbed barbed fish production has been declining year by year, individual river sections have even disappeared, and resources have been exhausted. Degree, the success of artificial breeding of barbed fish, provides important technical support for the restoration of its resources, and is of great significance for the protection of ecological diversity.
■Technical background In 1995, the Yangshan County Aquatic Products Bureau discovered that the barbed-barred fish and fish have the advantages of good body shape, beautiful color, large individuals, strong adaptability, herbivorous nature, and other foods. Fresh and refreshing meat is a folk “fish and fish†dish. It is deeply loved by the people. Over the years, due to serious human damage, the number of barbed fish and fishes in rivers has been declining. For this reason, the Bureau has protected both resources and The development of the use of characteristic fisheries in mountainous areas started in 1997, and preliminary experiments were carried out for the artificial domestication of barbed fish and the cultivation of broodstock. In July of this year, the artificial propagation experiment was conducted again. After several batches of hatching practices, preliminary knowledge of artificial propagation techniques was obtained and a small number of reproduction stages were entered. At the same time as research on artificial propagation techniques, the Bureau also conducted trials of seedling cultivation and adult fish breeding, all of which achieved very good results. The bureau has about 20,000 fish fry 2-25 cm and about 10,000 fish.
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