Stingray Artificial Propagation Technology

The artificial breeding of yellow catfish has important practical significance for adjusting the structure of aquaculture and increasing farmers' income. The artificial breeding techniques of yellow catfish are described below.

The broodstock selected individual females from 100 to 125 grams, and the abdomen expanded, the outline of the ovary was obvious, and there was an ovarian flow phenomenon. The gonads expanded, and they were wide and round and red. Hand touch the fish's belly, soft and flexible. Individuals of male and female fish are between 125 and 175 grams. The body color is dark yellow, and the genital process is long and pointed, with 0.5 cm or more protruding, and the genital hole is pink.

The oxytocin production is carried out in a flowing cement pool with an area of ​​6 to 10 m2, a water depth of 0.6 to 0.8 meters, and a water temperature of 24 to 26C. Per kg of female broodstock, 20-30 micrograms of ovulation-promoting (LRH-A2) and 600-1000 units of human chorionic gonadotropin (HCG) were used, and the male dose was halved. Female broodstock uses two pectoral fin base injections, the first injection of 1/3 of the total dose, interval of 14 to 18 hours for the second injection; male and female fish in the second injection of female broodstock injection.

After the second injection of the artificial insemination female fish, the water temperature is 24 ~ 26 °C, the effect time is 24 to 28 hours. Artificially squeezed eggs 1 to 2 hours after the predicted effect time expired, while killing the males, taking the testes, grinding and grinding, mixing well with the eggs, slowly adding a small amount of water 15 seconds later, stirring constantly with the feathers, and stirring the fish 30 seconds later. Eggs stick to the nest for hatching.

Incubation hatching is performed in a cement pool using microfluidic water incubation. The hatching pond area is 5 to 10 square meters, the water depth is 0.6 to 0.8 meters, and the water temperature is controlled at 24 to 26°C. Fertilized egg 3000-5000 tablets per square meter.

Seedlings fertilize eggs at a water temperature of 24 to 26°C and normally hatch larvae after 72 hours. The larvae began to feed 3 days after they came out of the membrane. The open-ended feed can be used for zooplankton cultured exclusively in ponds. Filters are used to filter out impurities and large pests; egg yolk can also be filtered and fed. About 10 days in the hatchery, the fry can only be cultivated when the fry can swim normally and actively take outside food.

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