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1. Select broodstock to choose 3rd to 5th instar and weigh 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.
Artificial breeding of fry
First, artificial breeding of fry