The punctuated tail has a delicious flesh and rich nutrition, especially no intermuscular puncture. The processing and export prospects are very broad. At present, raw materials for processing enterprises are in short supply; with fast growth, large individuals, mixed food, strong disease resistance, and high catch rate , Suitable for wide temperature and other characteristics, and thus favored by consumers and farmers. In recent years, as a new breed of cultivars has been rapidly promoted, the supply of seedlings is the bottleneck of breeding. According to the author's practice, the key techniques for seed breeding are described below. First, the artificial reproduction of fry 1. Broodstock choose to choose 3 instar ~ 5 years of age, body weight 2.5kg ~ 3.5kg of broodstock. In the non-reproductive season, males and females have slightly wider heads, darker body colors, and slightly narrower female heads. During the reproductive season, males have larger muscle tumors on both sides of their heads. The gonads have papillae. The abdomen is stiff and hard to bend. The female genital hole is round and concave, and the abdomen is soft and inflated, showing pale gray. Male to female ratio 3:2. 2. The broodstock cultivation pond area is 2500m2, the water depth is about 1.5m, and the 667m2 stocking capacity is 20 to 30. When the water temperature is higher than 13°C, special feed is started. When the water temperature is 21°C or above, the feed rate is 2% to 4%, and appropriate animal supplements (broiled small fish, shrimp, etc.) and vegetal (major malts) etc. are added. feed. Rinse once every 10 days to stimulate gonad development in broodstock. 3. The artificial oxytocin-promoting agents include carp pituitary (PG), human chorionic gonadotropin (HCG) and luteinizing growth hormone gonadotropin and its analogue (LRH-A). Per kg of female fish used PG4mg ~ 6mg, or HCG1000 international units, or LRH-A2mg ~ 2.5mg, or PG + HCG mixture 2mg +600 ~ 700 international units. The male dose is halved. 4. Set up a fish nest Plastic buckets, iron buckets, wooden boxes, etc., which can hold a pair of broodstock, are used as fish nests. One end of the nest is open for broodstock to come in and out, and the other end is covered with a nylon cloth. After the brooding fish spawned, the fish nest was placed on the bottom of the pool 3m~5m, water depth 0.5m~1m, the opening was towards the center of the pool, and a float was attached to the fish nest to facilitate the positioning operation. The fish nest spacing is 9m~10m, and the number accounts for 50% of the broodstock. 5. When the egg collection temperature is above 21°C, the fish nest should be briefly mentioned every day from 10am to 11am, and the broodstock should be driven off. If there is an egg, gently remove it and put it in a smooth barrel with a pool of water. 6. When the egg hatching temperature is 25°C~29°C, the fertilized egg takes about 110 hours to 120 hours, and it takes about 10 days from larvae to juveniles. The eggs can be naturally hatched in ponds and hatched by hatching tanks. Incubation requires a water temperature of 25°C to 28°C, a pH value of 6.5 to 8.0, dissolved oxygen of 6 mg/L or more, and an exchange of water volume of about 20 liters (minutes, the same below). 7. To prevent water mold can be used or mildewin formalin alternately to prevent water mold infection, before the fish eggs become red, once a day, water mold net 60mg ~ 65mg / L time for 10 minutes to 12 minutes Formalin 100mg/L immersion time 4 minutes to 10 minutes. Second, summer flowers, fish breeding 1. Pond condition seedlings pool requirements close to the water, good water quality, easy access to the water, the bottom of the pool flat, less silt, pond sturdy, no leakage. The area of ​​the summer flower nursery pond is about 667m2. The area of ​​the fish breeding pond is generally 2001m2~3335m2, and the water depth is 1.3m~1.6m. Each fishing pond needs to prepare 1.5kw or 2.5kw aerators, and it is equipped with a pump pump. 3. Ten days before the stocking of fry and fish fry, the water is filtered and the water depth is 0.6m~1m. Fermented organic manure (manure, cake fertilizer is available, the dosage is depending on the sediment quality of the pond, usually 100kg~500kg/667m2), To raise the natural planktonic bait in the pool. 4. After 3 days to 4 days after fry release, the fry grows to 4cm to 5cm in summer. This method can be similar to the method used in the cultivation of the “Four Homes†fry, with 30,000 to 50,000 fry per 667m2. It takes about 20 days to 30 days, and then it is sparsely divided into ponds and transferred to the breeding stage. From summer flowers, about 50g of large-sized fish species are cultivated, and 8000 to 9,000 summer flowers are placed per 667m2, and stocking 600 to 700 tails of squid and squid are stocked at 6cm to 10cm. 5. Feed the fishes that have just been fished in the ponds. Feed the feeds in the pond for 4 days to 5 days, and feed the zooplankton in the pond. When the fish fry reaches 4.5 cm or more, feed the compound feed. When feeding, tame the food by feeding the fish to the water at the feeding site to send a sound to stimulating the fish before feeding. Then sprinkle a small amount of bait and repeat it repeatedly every 10 seconds. Taming for 10 minutes to 20 minutes, so the cycle of 4 days to 7 days, you can make the fish form the habit of eating groups. The protein content of the feed is about 40%, and feeding twice a day, the bait rate is 3% to 5%. 6. Daily management requires dissolved oxygen to be greater than 3 mg/L and pH 6.5 to 8.3. During the breeding period, every 7 days to 10 days, new water is exchanged for 1 time. The depth of water increases with the increase of the fish body and gradually increases to about 1.5m; the chlorine dioxide concentration is 0.5mg/L Quanchiposa in order to prevent fish disease. And regulate water quality. Third, seed fishing and transportation 1. Seed fishing catch summer flowers are generally in the morning or evening, when the water temperature during summer fishing is low. Summer heat, taking into account the summer float head and water temperature factors, such as in order to catch a flight for air transport, you can catch the summer flowers the evening before, placed in the seedling box flush, shipped the next morning. 2. Summer flower transport to carry out 2 to 3 times before the net pull exercise, with specifications 30cm30cm40cm nylon bags, each bag of water 3L ~ 4L, put summer flowers 1500 to 3000 tail, you can transport 12 hours to 18 hours. Summer fishing and packing should be carried out with water. In order to prevent the nylon bag from being damaged during transportation, it can be packed in a special cardboard box, and then tied with a rope to make it ready for shipment. During transportation, if the time is longer, water can be changed or reoxygenated in midstream if conditions permit. 3. Fish fingerlings should be caught in warm and sunny weather from November to April next year. At least 2 pull-net exercises are required before catching. They need to stop for 2 days and flush with water for 3 hours. 4. The oxygen-loaded nylon bags are used for transport of fingerlings. Each bag of fish should not exceed 0.5kg. Shipping with fish oysters, the inside of the oyster sauce should be smooth, nylon lining can be placed to prevent abrasion of the fish body, and a sub-sealing type should be used to prevent the fish species from escaping. The interior of the fish oysters is supplied with pure oxygen, and the shipping density is about 30kg per cubic meter of water.
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2. Clear ponds disinfect fish seedlings in front of the pond before draining water, digging too much silt, let the sun at the bottom of the pool for 20 days, and then into the water 10cm, with quicklime 75kg ~ 100kg/667m2 watered pulp after Quanchiposa disinfection .
Channel fork tail, seed size breeding and catching