First, raise broodstock 1-3 years of age, weight 0.5-2.0 kilograms of older fish as broodstock. When cultivating, they should be polycultured in large areas, clear water, high dissolved oxygen, feed fish, shrimp, fish ponds, or food ponds, with 10-20 fishes per acre. The animals were intensively raised 30 days before the spawning period. The daily feed is 3%-5% of the broodstock's weight. Or choose a micro-fluid water or drainage and irrigation water to facilitate the single pond, the pro-fish pond area should have 2 acres to 3 acres, water depth of 2 meters, 75-150 brood fish per acre, rearing 6.6-10 cm squid 50, To adjust the water quality, add 5-6 cm of wild fish or domestic fish as feed, and inject new water frequently to keep the water fresh.
Second, select the fish species to distinguish the male and female from the fish's body shape and urinary nipple structure. The female body is relatively short and thick, and the abdomen expands and softens in the spawning season. The outline of the ovary is obvious. The upper and lower abdomen are even and elastic in size. The urogenital nipples are slightly convex. The oviposition period is rosy. There are two holes on the abdomen, and the fallopian tubes and the ureters are on the front and back. Open. The male body is relatively long and thin, with a small belly during the breeding period. The urogenital nipples are sunken. There is only one hole. A small amount of milky white semen flows out of the abdomen.
Third, the construction of spawning pool spawning cement pool, an area of ​​10-30 square meters, water depth 0.4-0.5 meters. In the middle of the pool or in the middle, each pair of broodstock is laid with an 11-meter-wide polyethylene dense mesh sheet to make nests in the bottom of the pool. The mesh is pressed with stones around it, and a small layer of stone is used in the middle. The area for spawning in ponds should be 1-2 mu and the water depth should be 0.4-1.0 meters. Disinfect with clear lime ponds before use to remove aquatic insects, wild fish, shrimps, etc., then press on the slopes on the southeast or all sides of the pool. Laying spawned nests with concrete pools.
Fourth, oxytocin from the beginning of March to mid-May, when the water temperature is 18-26 °C, per kilogram of female fish injection of carp pituitary (PG) 5-6 mg, or use of human chorionic gonadotropin (HCG) 2000 International Units (IU) , using 1 injection. Male fish halved. Artificial oxytocin was conducted so that the females were concentrated and hatched. If the water temperature is 20-26°C, the effect time is about 20 hours.
Five, spawning fertilization after the injection of male and female fish into the cement pool or pond in accordance with the ratio of 1:1 spawning, the cement pool put 1 pair every 2-3 square meters, ponds put 20-30 pairs of broodstock per mu of water. The spawning pond is best to be in a place where there is still water, micro-flowing water, and fresh water. After spawning, the male fish will build a fish nest first, and the male and female fish will be automatically matched to occupy the nest of eggs. The eggs are sticky, and the female broods will stick their eggs on mesh or pebbles, and the males will guard the eggs. The spawning pool environment should be kept quiet. The spawning effect takes 1-2 days in a row. It is usually only on the 3rd day that eggs are found on the mesh. If the broodstock enters the pool and eats eggs due to hunger, it is advisable to feed the fish just dead or to catch the broodstock that produced the eggs. After hatching the eggs, all the brooders were caught using the net.
6. The water quality of hatching cement pool should be fresh, the water depth should be 0.3-0.4 meters, and the sunlight should not be allowed to shine. With micro-flowing water or oxygen-increasing equipment, the egg-forming rate can be greatly increased. The depth of pond hatching is 0.4-0.5 meters and the water quality is fresh. When hatching, the eggs must be laid evenly, with 10,000 eggs per square meter. Three days after larvae hatch, melanin appears and the larvae swim out of the nest.
Second, select the fish species to distinguish the male and female from the fish's body shape and urinary nipple structure. The female body is relatively short and thick, and the abdomen expands and softens in the spawning season. The outline of the ovary is obvious. The upper and lower abdomen are even and elastic in size. The urogenital nipples are slightly convex. The oviposition period is rosy. There are two holes on the abdomen, and the fallopian tubes and the ureters are on the front and back. Open. The male body is relatively long and thin, with a small belly during the breeding period. The urogenital nipples are sunken. There is only one hole. A small amount of milky white semen flows out of the abdomen.
Third, the construction of spawning pool spawning cement pool, an area of ​​10-30 square meters, water depth 0.4-0.5 meters. In the middle of the pool or in the middle, each pair of broodstock is laid with an 11-meter-wide polyethylene dense mesh sheet to make nests in the bottom of the pool. The mesh is pressed with stones around it, and a small layer of stone is used in the middle. The area for spawning in ponds should be 1-2 mu and the water depth should be 0.4-1.0 meters. Disinfect with clear lime ponds before use to remove aquatic insects, wild fish, shrimps, etc., then press on the slopes on the southeast or all sides of the pool. Laying spawned nests with concrete pools.
Fourth, oxytocin from the beginning of March to mid-May, when the water temperature is 18-26 °C, per kilogram of female fish injection of carp pituitary (PG) 5-6 mg, or use of human chorionic gonadotropin (HCG) 2000 International Units (IU) , using 1 injection. Male fish halved. Artificial oxytocin was conducted so that the females were concentrated and hatched. If the water temperature is 20-26°C, the effect time is about 20 hours.
Five, spawning fertilization after the injection of male and female fish into the cement pool or pond in accordance with the ratio of 1:1 spawning, the cement pool put 1 pair every 2-3 square meters, ponds put 20-30 pairs of broodstock per mu of water. The spawning pond is best to be in a place where there is still water, micro-flowing water, and fresh water. After spawning, the male fish will build a fish nest first, and the male and female fish will be automatically matched to occupy the nest of eggs. The eggs are sticky, and the female broods will stick their eggs on mesh or pebbles, and the males will guard the eggs. The spawning pool environment should be kept quiet. The spawning effect takes 1-2 days in a row. It is usually only on the 3rd day that eggs are found on the mesh. If the broodstock enters the pool and eats eggs due to hunger, it is advisable to feed the fish just dead or to catch the broodstock that produced the eggs. After hatching the eggs, all the brooders were caught using the net.
6. The water quality of hatching cement pool should be fresh, the water depth should be 0.3-0.4 meters, and the sunlight should not be allowed to shine. With micro-flowing water or oxygen-increasing equipment, the egg-forming rate can be greatly increased. The depth of pond hatching is 0.4-0.5 meters and the water quality is fresh. When hatching, the eggs must be laid evenly, with 10,000 eggs per square meter. Three days after larvae hatch, melanin appears and the larvae swim out of the nest.