Tang carp artificial propagation method
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Tang carp is one of the freshwater economic fishes in southern China. Due to the fact that Tanggu fish has more meat, less thorns, delicious taste and rich nutrition, it is loved by people. The summer and autumn seasons are the breeding season of local pond catfish. The following describes the artificial propagation method of pond catfish. First, the sex and maturity of broodstock identification broodstock is used to breed fish fry. The broodstock can be wild or cultivated. Tanggu fish can be mature in one age and weigh 100-150 grams. Mature female abdomen inflated, the outline of the ovary is obvious, the genital hole is blunt and red and swollen, and the granules flow out from the abdomen. Mature males have more genital pores, are not red and swollen, have a black spot at the end, have a thick body surface, and have a dark body color. Second, oxytocin and its dosage 1, the hormone used for the production of pond catfish has chorionic gonadotropin and fish pituitary gland. According to practice, each broodstock (125 g) uses 600-1000 IU human chorionic gonadotropin or 1-2 pituitary glands per side (carp pituitary gland of about 500 g body weight). It has a good effect on the production of mature pond catfish. 2, the preparation of injection: hormone injection using normal saline or distilled water, injection solution is controlled within 1 ml. If the pituitary gland of fish is used, the required number of fresh pituitary glands should first be placed in the iliac crest, finely ground, and a little 0.7% physiological saline is added to make the suspension into a syringe for use. (Preparation of 0.7% physiological saline, use 1000ml cold boiled water to dissolve 7g common salt). 3, injection site: Injectable pectoral fin base or dorsal fin muscle (from the front of the dorsal fin about 1 cm on both sides can be), the two have the same effect, generally the latter is better. The puerpera fish can be injected once or twice, both of which can obtain satisfactory results, and the two injections are more stable. 4, injection time, should be based on the weather, water temperature and work convenience and flexibility. If two injections are used, the first needle is generally injected at noon and the second needle is injected in the evening. The next morning, eggs can be laid. Third, egg spawning hatching pond eggs are beige sticky eggs. Spawning ponds can be used for cement pools, water tanks, tubs, and earth pits. The spawning pond and the inner wall of the hatching pond are covered with plastic film. The depth of the water is maintained at 10 cm or more and 50 cm or less. The fish nests are all provided for spawning. The fish nests are made of fake narcissus, and the fake narcissus fibrous roots must be smooth and free from mud adhering. Cut stems and leaves and disinfect with potassium permanganate solution to prevent saprophytic disease. Each pond is placed in a group (a female and a male), covered with a cover to prevent escape, and is generally covered with bamboo textiles. After the broodstock lays eggs, the broodstock will be removed and the fertilized eggs will be left in the spawning pool and incubated with microfluidic water. According to practice, the larvae are hatched from the fertilized eggs of pond catfish, and the talcum powder is used as the threshing agent. Ten grams of talcum powder per 10,000 eggs were added to the talcum powder by tumbling the fertilized eggs. The fertilized eggs after threshing can be hatched on the hatching tank (wide mouth water tank can be). Adopting a family fish pump, a sand filter head is placed in the incubator tank to accelerate the oxygen in the air to dissolve in the water so that the fertilized egg can develop normally. If the water temperature is 25-27°C, 48-72 hours can be hatched. Small fish. Tang carp is spawned in batches, and 125 grams of broodstock can produce 1000-4000 eggs. Postpartum broodstock can be bred for about 40 days for the second time. After 4-5 days after fry hatching, the fry is 0.5 cm long and the yolk gradually disappears. After that, some cooked egg yolks can be fed and the fry can be transferred to a cultivation pond for cultivation. Fourth, fry cultivation with cement pond or small pond cultivation, small ponds have a high survival rate. Small pond area of ​​about 20 square meters, water depth to maintain 10-20 centimeters is appropriate, in the first week before the fish ponds under the eradication of weeds in the pond, each pond with 2.5 kg of tea bran, lime 1.5 kg clear pond, kill the insect pests in the pond After the toxicity disappears, the fry can be released. After every cubic meter of water, 500 fish fry can be released. After the fry, the fish is fed with animal feed, such as leeches, silkworm cocoons, and some salt-free animal blood such as pig blood and three birds. Blood or soaked peanut bran. Water quality should be green and blue. In order to prevent the sun from direct sunlight, some fake narcissus shades can be placed on the fish nursery ponds. At the fry and adult fish stage, pine needles can be used as a feed additive, and the proportion accounts for 3%-5%, so as to reduce fish diseases and increase appetite. The fish seedlings can grow to more than 1 cm in 10 days after the lower pond, 2-2.5 cm in 20 days, and 3.5-4 cm in 30 days. At this time, they can be caught and supplied to the family fish pond to develop commercial fish for sale.