Red fins, natural habitat like the habitat of lakes in the lush waters, or rivers in the slow flow area, have a strong adaptability, can survive in the more basic water body, slower growth. Carnivorous, larvae feed on branches, copepods, and aquatic insects. Adult fish feed on small fish, shrimp, snails, insects, larvae, and horns. The red fins are sexually mature at 3 years of age and are breeding season from May to July. The eggs are sticky and adhere to the stems, leaves, and gravel.
First, the broodstock
Requirements of abundant water, fresh water, no pollution, easy access to drainage, an area of ​​1 to 3 acres, water depth of about 1.5m. If the broodstock pond is too large, it is easy to cause damage to the fish body due to excessive number of grazing nets, and it will affect the broodstock to eat and cause nutrient subsidence, thus affecting spawning. The broodstock nursery is best beside the spawning pond for easy handling and reduction of broodstock deaths.
Second, broodstock collection and cultivation
Every winter, when the water temperature is around 10°C, broilers weighing more than 1 kg and older than 3 years old are collected from natural waters such as rivers or lakes. Since the fish is dehydrated and susceptible to death, care must be taken in fishing and transport operations. If the broodstock raised in the pond, need to pull the net to exercise 2 to 3 times and then shipped. It is also possible to choose from farmed commercial fish, but inbreeding must be avoided. Before stocking, use 5% salt water for disinfection, then put it into a pond for cultivation, and put about 200kg of mu. The feed is mainly used for small-size fresh fish, and the amount of feed should be sufficient to ensure that the broodstock can feed, and recharge every 3 to 5 days, or use fresh fish to cut into small pieces and feed it. Oxygen is often increased before reproduction, which is conducive to the development of gonads.
Third, male and female identification and broodstock selection
Every year from June to early July, artificial breeding can be carried out when the water temperature rises to 26°C. Mature broodstock, male fish head, pectoral fins, back, etc. appear white pearl star, feel rough, light pressure after the abdomen reproductive hole will have semen outflow, weight 0.8 kg or more. The body surface of the female fish is smooth, the abdomen expands and is soft, the outline of the ovary is obvious, the body weight is above 1kg. Male to female ratio is 1:1 to 1.5:1.
Fourth, oxytocin, hatching
The spawning and hatching pools can be separate or the same pool. If the same tank is used, the circular loop structure is selected, ranging from 3 to 4m in diameter. At the bottom, there are multiple vertical water outlet holes parallel to the ring road, and the upper half of the center is provided with a 60-mesh sieve outlet water filter. The depth of the pool is about 1m. Water sources require fresh water. In early June each year, oxytocin can be produced when the water temperature reaches 26 to 28°C. Each group of broodstock per pool 6 to 10 groups, the flow rate of water control in 0.1m / sec or so, and hanging a small amount of brown tablets or polyvinyl chloride mesh for ovarian production. After the broodstock is placed in the spawning pool, a mesh must be placed over the pool to prevent the brooders from jumping out and causing unnecessary injuries.
The oxytocin was LHRH-A2, DOM and HCG mixture. The dose of female fish was 10 μg LHRH-A2 per kilogram, DOM 5 mg, and HCG 1000-1500 IU; the dose of male fish was halved, and 2 ml per tail was injected. In the base of pectoral fin injection, the effect time is 8 ~ 10h.
There are two ways to pick eggs, one is artificial aphrodisiac, let it spawn on its own; the second is artificial aphrodisiac artificial insemination. If the broodstock itself spawns, as long as the trophozoites after the injection of broodstock into the spawning pool can be, after the end of spawning will be all broodstock caught, the body of a good retention, poor treatment. The eggs were hatched in the original pool. For artificial insemination, when the broodstock begins to heat and form a peak, the male and female brood fish are captured separately, the water on the fish body is wiped off, and then the egg and the semen are squeezed together into a dry basin, and the hard chicken feathers or fingers are constantly stirred to make It is fully fertilized. After a few minutes, slowly pour the fertilized eggs into the water that has been prepared with mud or talcum powder and de-stick, continue stirring until the fish eggs do not clump. After a few minutes, the degummed eggs are washed in clean water, and then poured into a hatching bucket for running water incubation.
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