CATDOLL : CATDOLL: How to breed snakehead fish

1. How to breed snakehead fish

Snakehead fish reproduces by spawning, also known as black snakehead. The maturity age of black snakehead in different waters is different. It matures at the age of 2 in the Changchanzhijiang River system and at the age of 3 in the Heilongjiang River system. The spawning period is from May to July in southern waters and from June to July in northern waters.

The spawning grounds of the black snakehead are in places with thick grass, and the bottom is usually muddy and shallow water that is sheltered from the wind, and areas with still water or slow currents. During the reproductive season, the parents will move in pairs in the spawning grounds, and they are very active, often jumping out of the water and building ovaries in the water grass.

The black snakehead fish is a single-spawning type. After spawning, a pair of parents or only the male fish lurks near the ovary to guard the young eggs and does not allow other fish or frogs to approach to avoid harming the offspring.

Additional information:

The black snakehead fish is a single-spawning type. After spawning, a pair of parents or only the male fish lurks near the ovary to guard the young eggs and does not allow other fish or frogs to approach to avoid harming the offspring.

The newly emerged fry are about 4.1mm in length, with melanocytes all over their bodies. Oil balls make the front end of their bodies significantly swollen, similar to tadpoles, and they often lie on the water surface.

After the eggs hatch, when the fry grow to about 3 cm, their range of activities begins to expand. At this time, the parents and fry gather together, and the adult fish follow and protect the fry. After about 20 days of protection, the fry begin to disperse when they grow to the juvenile stage, and the parents stop their protection behavior.

2. Why do snakehead fish go blind after spawning? How many eggs can be produced in one reproduction?

Snakehead fish will not go blind after spawning. The breeding water temperature of snakehead fish is 18-30℃, and the suitable water temperature is 23-28℃. The spawning sites are mostly still water banks with lush aquatic plants. Before spawning, the parent fish will pick up aquatic plants to build a nest. The diameter of the ovary is generally about 50 cm and floats on the water surface. After the ovary is built, the male and female parent fish will chase each other and mate, and then the female fish will lay eggs in the nest.

1. Why do snakehead fish go blind after spawning?

1. Black carp will not go blind after spawning. The breeding water temperature of black carp is 18-30℃, and the suitable water temperature is 23-28℃. After entering the breeding period, they usually spawn on the still water bank with lush aquatic plants.

2. Before spawning, the male and female broodstock will pick up water plants (or plant fragments) as nesting materials, and the ovaries will float on the water surface, with a diameter of about 50 cm. After building the ovaries, the male and female broodstock will chase each other and mate, and then the female fish will lay eggs in the nest.

3. After the female fish lays eggs, she will lurk near the ovaries with the male snakehead fish to guard the young eggs and prevent other fish from approaching. When the eggs hatch into fry and the fry grow to 4-5 cm, the parents will leave the nest and stop protecting the young.

4. The spawning and reproduction time of snakehead varies from place to place. It is usually from May to July in the north and from April to May in the south. The sexual maturity time of snakehead is mostly in the second winter, at which time the individual can generally exceed 30 cm and weigh more than 0.5 kg.

2. How many can black carp produce at one time?

1. How many eggs a black carp can lay in one reproduction mainly depends on its own size. If the body length is 50 cm, the number of eggs it can lay is generally around 35,000; if the body length is 40 cm, the number of eggs it can lay is generally around 20,000; if the body length is 30 cm, the number of eggs it can lay is generally around 10,000.

2. The number of eggs carried per kilogram of body weight is about 10,000 to 20,000, and spawning can be carried out in multiple times.

3. The newly hatched young fish are covered with melanocytes all over their bodies. They are about 4.1 mm long and often lie on the water surface. The oil balls will cause the front end of their bodies to swell significantly, similar to tadpoles.

4. When artificially breeding snakehead carp, you can choose mature and strong male and female snakehead carp as broodstock, and the appropriate ratio between the two is 1:1.

3. How to breed black ulier fish? In what season do black ulier fish spawn?

Artificial breeding of snakehead fish

1. Parent fish selection: Mid-May of each year is the breeding season for snakeheads. Mature and strong male and female snakeheads should be selected in a 1:1 ratio as parent fish. The method of distinguishing between male and female is that the abdomen of female snakeheads is swollen and soft, black and white, with obvious ovarian outlines, a concave groove in the center, and a protruding genital pore in pink; the body color of male black mullet is purple-red, with small transparent white round spots arranged neatly from bottom to top on the dorsal fin, a dark abdomen, and a slightly enlarged, slightly concave, triangular, and light pink genital pore. Before inducing spawning, put the male and female fish in the net cage for a day and do not feed them, which is more conducive to spawning.

2. Inducing spawning in broodstock: Female fish are injected twice, the first injection is 1/3 of the full dose, 18 to 26 hours apart, the remaining dose is injected once, the male fish dose is half of the female fish dose, injected during the second injection of the female fish. Fish bodies are mostly injected into the thoracic cavity, at a 45° angle to the fish body, with a depth of about 1 cm. Commonly used hormones include carp and crucian carp pituitary glands, with a dose of 4 to 8 per kg for female fish and half for male fish; or chorionic gonadotropin, with a dose of 16,000 to 24,000 international units per kg for female fish and half for male fish.

3. Fish egg hatching

① Artificially simulate natural environment incubation: After injecting oxytocin, male and female fish are placed in the pond at a ratio of 1:1, and allowed to spawn, fertilize, and hatch naturally. After the fry are hatched, the snakehead fish is allowed to take care of them freely by taking advantage of their habit of protecting their young. This method saves labor and time, but the disadvantage is that the survival rate of the fry is low and the growth and development are inconsistent.

② Artificial cage hatching: After injection of induced spawning, male and female fish are placed in a 4-6m2 cage at a ratio of 1:1 for spawning and fertilization. The broodstock are then removed and placed in a large pond. The fish eggs are placed in a 40-mesh cage, with 10,000 fertilized eggs placed in each cage. The eggs are incubated using micro-flow water. The hatching rate depends on the fertilization rate and water quality. The temperature is 22-27℃, and it takes 32-48 hours. Check frequently and remove unfertilized eggs in time.

4. Seedling cultivation: Before the fish emerge from the membrane to 2 cm, they should be placed in a 1m×0.5m×0.5m net cage made of 40-mesh mesh, with a density of 2,000 fish/m2. 4-5 days after the fish emerge from the membrane, feed them with rotifers, cladocerans, copepods, etc., using a small amount and multiple times method, once every 4 hours, for 3-4 days; then increase the amount of feeding and reduce the number of times, gradually transitioning to twice a day. When the black fish fry reaches 2 cm, change to a net cage made of 8-16-mesh summer flower mesh, with an area of ​​10-15m2, preferably rectangular, with a density of 500-600 fish/m2.

5. Feeding: The bait is mainly zooplankton. When the fish are 4 to 5 cm in size, feed them with fish paste and zooplankton. To prevent dirt and filamentous algae from clogging the mesh, brush it once a day, change the cage once a week, and disinfect it thoroughly.

Snakehead carp breeding technology

1. Pond construction: Choose an east-west oriented, rectangular pond with mud at the bottom, a depth of 2 to 2.5 meters, and a water depth of 1.5 to 2 meters. Escape prevention facilities must be installed for water inlet and outlet. Apply quicklime at 100 to 150 kg/mu for thorough disinfection 15 days before breeding.

2. Stocking of fish: Before stocking the fish, soak them in 3% to 5% salt water for 10 to 15 minutes and then put them into the pond. For fish with a body length of 10 to 14 cm, the stocking density is 9,000 to 10,000 per mu, and for fish with a body length of 16 to 20 cm, the stocking density is 8,000 per mu.

3. Daily management: Pay attention to the feeding, activity, disease trends and environmental changes of snakehead fish. Change the pond water 4/5 times a week in spring, change it every 3 days and every 7 days in hot season. The water inlet and outlet should be connected to prevent the net from escaping. The pond bank should be at least 50 cm above the water surface. For the discharged sewage, necessary sewage treatment should be carried out.

4. Feeding: The feed for feeding black carp includes artificial compound feed, small fish from freshwater or seawater, and scraps from slaughtered livestock and poultry. Before feeding, small fish need to be sorted and fish with hard spines, such as yellow catfish, need to be removed. Before feeding, use clapping as a signal to gather fish from a distance near the bait table to reduce feed waste. The initial feeding amount is 10% of the body weight, which can be appropriately reduced to about 5% of the body weight later. It should be fed one spoonful at a time, so that there is less feed waste. Feeding should be based on the "four fixed" principle, and 3 to 4 feeding points should be selected for each pond. Intensive breeding is adopted, with a body length of more than 10 cm. After 8 to 9 months of breeding, the survival rate is 75% to 80%, the average weight is 0.5 to 0.7 kg, and the yield per mu is 4,000 to 5,000 kg. Some aquatic plants such as cattail, bitter grass, water peanuts, etc. are planted in the pond, and the planting area is controlled at 1/3 of the pond area.