How to raise osmanthus fish
Osmanthus fragrans has early sexual maturity. In southern China, the male fish can mature at 1 year in winter, and the female fish is 2 years old. They can lay eggs naturally in rivers, lakes and reservoirs, and they can lay eggs many times a year. In the Yangtze River basin, the spawning period is usually from May to July. Sexual maturity is early, sexual maturity is 2 years old, and the smallest individual with sexual maturity is 2 10 mm, weighing 250 grams. It is a batch spawning fish, which can spawn many times in its life. The spawning period is from May to August, and a few can be extended to August. Most of them lay eggs at night. The eggs are floating, round, yellow and have oil balls. Egg diameter 1.2 ~ 1.4 mm, after fertilization, the egg belly expands, and the egg diameter is about 2 mm. Generally, the number of eggs conceived is between 2.7 ~ 265,438+0.3 million, which is lower than the size of fish. The water temperature is 265,438+0 ~ 24℃, and it can hatch in 72 hours. The newly hatched larvae are 4.2 ~ 4.4 mm long, and their eggs are semi-floating, so they can float and hatch with the current. Siniperca chuatsi grows rapidly, and the maximum individual weight can reach 10 kg. But the specification of 0.5 ~ 1 kg is the best seller in the market.
Mandarin fish like running water when laying eggs. In artificial breeding,1~ 2kg healthy parent fish is selected and raised in a special pond. When feeding wild fish or commercial feed, artificial spawning can be carried out, and carp pituitary gland, HCG, LRH-A and other hormones can be injected to let them ovulate naturally. Siniperca chuatsi eggs are slightly sticky, with a higher specific gravity than water and easy to sink to the bottom. When hatching in the loop, the flow rate should be increased and should not be lower than 0.2 m/s. After 3 ~ 4 days, the fertilized eggs can hatch into fry. More fry can be obtained through artificial insemination. You can also fish for natural fry culture. Cement ponds should be used for seedling raising, with an area of tens of square meters. The water quality requires freshness and micro-flow. In addition, a small feed fry culture pond (other fish whose breeding period is basically synchronous with mandarin fish) should be attached to ensure the supply of live feed. Siniperca chuatsi have the habit of the law of the jungle, and when they lack feed, they will eat each other, which will affect the survival rate. Under the condition of sufficient feed, after 10 ~ 15 days, the fry can be bred into summer fish of about 3 cm. At this time, it can be transferred to adult fish culture.
breeding method
Polyculture is polyculture in adult fish ponds and then polyculture in parent fish ponds. Generally, about 3 cm of mandarin fish species are released in May, and 20-40 fish are released in adult fish ponds with more wild miscellaneous fish (the minimum size of domestic fish culture released should be larger than mandarin fish 1 times), and 30-50 fish are released in each mu of fish pond; More tilapia and crucian carp can be put in adult fish ponds, with 50 ~ 70 fish per mu; About 100 fish per mu are put into the pond where tilapia is over-cultured. Summer flowers such as silver carp and bighead carp should not be kept in ponds where mandarin fish are mixed, because mandarin fish grow fast and will devour small domestic fish. Because Siniperca chuatsi consumes more oxygen than domestic fish, the water quality in the pond where Siniperca chuatsi is mixed should not be too fat, and fresh water should be injected regularly. Siniperca chuatsi is sensitive to drugs, so we should master the accurate concentration when using drugs, and adopt low dose or stop using drugs in the season with high water temperature. The intercropping of Siniperca chuatsi in adult fish ponds mainly uses natural wild fish in the pond as feed, and some parent tilapia can also be intercropped to breed fry for food. Ponds near rivers and lakes where conditions permit can irrigate seedlings in the south of the Yangtze River and introduce wild fish as food. Siniperca chuatsi can be raised for 4 ~ 5 months, and can grow to the commodity specification of about 300 grams, and the yield of Siniperca chuatsi is 5 ~ 8 kilograms per mu. Monoculture refers to special pond culture. The pond area is about 1 mu, and the water depth is1.5 ~ 2m. The water quality requires freshness, and the water should be kept trickling. Put about 1000 summer mandarin fish about 3 cm per mu, and reasonably put wild miscellaneous fish such as tilapia, wheat ear fish and shrimp, or minced meat of snails and mussels for mandarin fish to eat. The feeding amount is 3% ~ 5% of the total weight of mandarin fish in the pond.