Black ridge barb breeding techniques

1. When the broodstock selects the black spiny barb, the broodstock requires up to 3 years of age, and the best body weight is 750g or more. The body is robust, and there is no disease or injury. In the reproductive season, the male and female pectoral fins are distributed with light yellow stout star-seeking stars (individual females also have star-chasing, but fewer), mature males, light pressure abdomen with milky white semen; female body surface Smooth, slightly enlarged and soft abdomen, reddish reproductive pores, and ovary contours in the abdomen. The broodstock for artificial propagation can be collected from wild fish caught in rivers before the breeding season. When collecting, pay attention to the broodstock's health and no damage. After a period of domestication to adapt to the pond environment, you can also choose the reserved body type from the artificially raised commercial fish. Large, well-growth individuals are used as reserve broodstock and cultivated by intensive culture. Generally, the latter has a better oxytocin effect.
2, broodstock breeding black spines barbed? Bred broodstock cultivation can be a single or polyculture, general polyculture with cockroaches, cockroaches, grass carp and so on. The broodstock area should be 0.2-0.3 square hectares, and the water depth should be 1.5-2.0cm. It requires sufficient water sources, convenient drainage and irrigation, and fresh water. Stocking specifications 500 to 1500g/tail broodstock 1500 to 1800. Tail / square hectare (equivalent to 1800kg / square hectare), the pool with 5% to 10% of scales, clams, grass carp, etc., to control water quality. During the cultivation period, it is necessary to feed high-quality compound feed (crude protein content is greater than 32%), and at the same time pay attention to feeding some green feed to prevent overgrowth from affecting spawning. One month before oxytocin, flush water frequently to stimulate gonad development in broodstock.
3. Artificial ovulation In late May of each year, when the water temperature is stable above 20°C, artificial ovulation is started. Females are injected with LRH-A2 15-20μg/kg or HCG1200-1500U/kg. They can also be mixed and used. 2 or 2 injections. Poor maturity can be injected at the beginning of May LRH-A2 1 ~ 2μg / tail ripening. The injection liquid is controlled at 2~3mL/tail, and the general operation uses thoracic injection. The ratio of male to female n:n+1, natural spawning or artificial insemination. At a water temperature of 20°C, the effect time is 25-30 h, the water temperature is 21-28°C, and the effect time is 10-20 h.
4, artificial hatching black spines barbed? Eggs larger, rapid expansion after absorption, egg diameter up to 2.5 ~ 3.3 mm, generally every cubic meter of water placed 400,000 to 50 million fertilized eggs, pay attention to hatch water to be fresh, and The warp window is filtered to prevent entry of harmful organisms and other impurities; during the incubation period, water flow is ensured, and dead eggs are removed in a timely manner to prevent the infection of aquatic molds. The black ridge barb is suitable for hatching with a water temperature of 22 to 28°C. High or low is not conducive to embryonic development, thus affecting the hatching rate and emergence rate. At a water temperature of 22-28 °C, larvae hatched after 65-115 h. The newly hatched larvae have a total length of 7.3 to 8.4 cm and an orange sac. After 3 to 5 days of free swimming and active feeding, the fry can be cultivated under the pond. Note that the temperature difference at the lower pond should not exceed 2°C.
5. Seedling cultivation Fry breeders choose cement or small earthen ponds, cement pools are convenient for management, and the area is 50 to 100 square meters. The stocking density is controlled at 50 to 100 tails per square meter. The pool is covered with black shade nets. The earthen ponds range from 1.2 million to 1.5 million tails per square hectare and grow to 2.0 to 3.0 cm in diameter and then transferred to a fingerling pond for cultivation. Fish ponds or cages for fish breeding, earthen ponds area 600-2000 m2, water depth 1.5-2.0m, cage size 4m2m2m or 2.5m2m2m, meshes 0.8cm, 1cm and 2cm, stocking density of earth ponds 450,000-50 thousand/ In square hectares, cages are stocked at a rate of 2000/m2, and then gradually decrease in density as the fish grows. After about 30 days of cultivation, the length of the fry can grow to 4.5 to 6.5cm in general. Nurture.
Fish breeding generally uses polyculture. The first 4.5 to 6.5cm summer flowers into 8 to 10 cm of fish species, stocking density of 120,000 to 180,000 / square hectare; the second stage to develop 12 to 16cm of 1 instar fish species, stocking specifications 75,000 - 90,000 tails per square hectare.
There are also summer flowers 2.5-3.5 cm in size in the cage cultivation, to a certain size, sparsely reared or transferred to the pond breeding, or 3 to 4cm specifications of the fish breeding in the fish pond, until the end of the year Get large-sized fish species. The black ridge barb is used for breeding of fish species, and can be fed with full-price compound feed or artificial diets such as rice bran, wheat bran, alfalfa, and snail, and natural bait, and regular feeding of appropriate green materials such as lettuce and rotifers. , vegetables, etc., to supplement some of the vitamins and promote the growth of fish.

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