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Bullet-bearing fish pond earthworm artificial breeding
The giant salamander is a member of the genus Euphorbiae, the family Bombyxidae, and the giant salamander, commonly known as jumping fish, muddy cattle, flower fish, and mud monkeys. It has the effect of delicious meat, nourishing and strengthening the body, high nutritional value, and is convenient for keeping for long-distance transportation. It is an excellent breed with high economic value and significant benefits. In order to solve the problem of Miaoyuan, Fuding City used a pond in Wenduyu District to conduct artificial breeding experiments on large-scale mudskipper fish ponds, and raised more than 300,000 large-scale eel-bearing fish species to solve the problem of shortage of large eel-bearing fry. The method is as follows: I. Breeding the broodstock The breeding period of the big salamander fish is from May to September, and the peak period is from May to June. In late April, purchase the 2nd-infested bighead fish in a 1:1 ratio of natural male to female and put them into the pond for nutritional strengthening and maturation. After the pond water was drained, rice bran and small trash fish were introduced, and benthic diatoms were cultivated. After more than one month of cultivation, the gonads began to mature gradually. From the middle of May to the beginning of June, the gonad maturation of the broodstock was at the end of the third stage. The male fish showed a milky white color by dissecting the testes, and the female fish gently squeezed along the genital pores to see the outflow of the yellow granules. Second, oxytocin production in mid-June in early June for the natural reproduction of the big mudskipper boom, the selected broodstock with a better maturity using HCG + A2 injection oxytocin, broodstock injected into 0.3ha of the incubation pond. Third, the embryonic development of large eel-coated fish eggs after fertilization egg membrane swelling, eggs from spherical to oval shape, in the water temperature 26-31 °C. Between 1.015 and 1.017, fertilized eggs began to divide in 4 hours. After 135 hours, the larvae gradually emerged from the membrane. After 4 days, the larvae began to swim flatly. Four, larvae bred larvae hatched for 3 days, began to put chlorella, so that the pond chlorella concentration was maintained at 2105 / ml, hatched larvae for 4 days to feed rotifers, the first time in the pond A total of 15 billion rotifers were added and fed one after another to maintain a certain rotifer density in the pond. A total of 35 billion rotifers were released. On day 5, the larvae began feeding on the Artemia nauplii and copepods, and also used artificial digging of fresh sea mud to set aside 0.3 hectares of ponds. The juveniles entered the juvenile period before and after 40 days of age. At this time, the juveniles and copepods were appropriately increased. From late juvenile to early juvenile period, the diet was dominated by animal feed. The young fish had a total length of about 2 cm before and after the 50th day of age, and they switched to diatoms.