Artificial Propagation Techniques of Chigularis

Artificial Propagation Techniques of Chigularis

The artificial reproduction technology of the sphenopalatophora, broodstock selection and cultivation of broodstock The squama jaw 2 is sexually mature in winter and has a body weight of 300--600g and a body length of 30--40cm. In the non-reproductive season, males and females are not easily identified; during the breeding season, they are easily identified. Males are generally smaller in size and have more beaded stars on their heads, lids, pectoral fins, and scales. They have rough surface and light pressure on the abdomen with milky white semen; females have large individuals, smooth body surfaces, and abundance of abdomen and outlines. The soft, mature female eggs are plump and tidy and easy to separate. The female weighing 500g can hold more than 190,000 eggs. In the breeding season, broilers with more than 2 years of age can be harvested from lakes and libraries, and broodless and innocent brooders can directly induce puerperium production, or after cultivating for half a month, the broodstock can be used for mature broodstock breeding. The cultivation of broodstock is not strictly required. For single breeding, 300-400 broodstock with a tail weight of about 500 g per 667 m2, and 50--100 tails for polyculture with a family fish. Generally just a little feeding and fertilization can be. After the spring, according to the water quality, every day or two, a small amount of fermented human and animal manure is administered, so that the water is kept at a transparency of 25-30 cm, and appropriate feeds such as bran, bean cake, etc. are made every day. In water, broodstock can reach sexual maturity by the breeding season. In order to adapt the broodstock cultivated in the pond to the operation of artificial oxytocin production, it is necessary to regularly pull the net several times in the spring to exercise. This will reduce the panic fear of the broodstock and avoid jumps and injuries when culling. Second, the artificial production of small scales is a batch spawning fish. In the Yangtze River basin, from late March to the end of June, it is its oviposition season and in May it is the peak of spawning. When the water temperature is stable above 18°C, oxytocin production can be carried out, but the optimum water temperature is 20°C--26°C. If the water temperature exceeds 28°C, the fertilization rate and hatching rate will decrease, and the broodstock will also be easily injured or killed. Among commonly used oxytocin drugs, the effect of pituitary gland and chorionic gonadotropin is preferred. The oxytocin dose of the female fish is 3–4 mg pituitary per kg body weight, or 50–100&g chorionic gonadotropin, and the male dose is halved. Due to the small individual broodstock, 0.5 mL is appropriate for each peritoneal injection. One or two injections can be used. In two shots, the first shot is injected with about 1/4 of the total dose, and the rest of the needle is injected 6-8 hours later. After the injection, the broodstock is laid into spawning ponds, loops, or cages to lay eggs. Using an injection method, when the water temperature is 18°C--20°C, the effect time is about 12 hours. About 10 hours at 20°C to -23°C, the effect time is delayed by 4 to 5 hours with the administration of human chorionic gonadotropin. Scale sticks produce sticky eggs, and their stickiness is lower than that of quail and squid eggs. Parents do not actively choose fish nests during spawning. Therefore, fertilized eggs are obtained by artificial insemination and de-bonding on the production, and the method of operation is the same as that of artificial insemination and de-bonding of carp. When the artificial insemination is performed, the fertilized fish eggs are poured into prepared mud water (the yellow mud is finely mixed with water and stirred into a thin mud, and filtered with a mesh of 40 mesh cloth), and the fish eggs are gently mixed while stirring, 3--5 Minutes can be de-bonded, then rinse fish eggs with water, and then hatch into the ring. If Natural spawning is used, apply thick mud to the pool walls before filling the spawning tank to prevent fish eggs from adhering to the pool wall. Before production, press the spawning pond every m, the water body is poured into the thick muddy water 1kg (1kg yellow mud finely add water 5kg stir into the mud, filter off the dregs), the fish eggs produced in such mud water can self debonding. About 1 hour after spawning, fish eggs can be collected and transferred to the incubation pool for hatching. Third, the flow of water to hatch its method and the home of fish eggs hatching the same water. However, the size of the larvae of the scales is larger, and the eggs are accompanied by mud, which is easy to sink. Therefore, the speed of the water flow is larger than that of the eggs of the family fish. It is better that the eggs can float in the flowing water. Pay attention to prevent fish eggs from depositing on the bottom of the water and cause a large number of deaths. Small incubating tanks, 100,000 eggs per 50 kg of water, and 500,000 eggs per m2 of water in the incubator ring. When the water temperature is 20 °C - 25 °C, about 35 - 45 hours of fry out of the film. The duration of fish fry emergence is longer, 80% - 90% of the fry in the first two days out of the film, all the film takes 3 days. As the egg membrane is not easily dissolved, management should be strengthened during the filming period. Three days after the hatching of the fry, the cicadas began to swim, but they could not eat at this time. It took only one to two days before they started to feed, and they were allowed to feed under the pond.

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