(1) Artificial breeding. High quality broodstock is the key to the success of artificial reproduction. Parents should weigh more than 10 kilograms. They can feed fresh feed during broodstock breeding, such as small trash fish, livestock and poultry, etc. They can also be fed artificial compound feeds, requiring crude protein content of more than 40%. Regular flushing, especially in the first month before labor, to increase the amount of flushing, increase its water stimulation. When the water temperature is appropriate, select the abdomen to expand, soft, abdominal can see the obvious outline of the ovaries, gonads expand and red females, light pressure on the abdomen with male outflow of male sperm for oxytocin production. When using artificial insemination, the ratio of male to female is 2:1; the ratio of male to female of natural spawning and fertilization is 2:3. The commonly used drugs for oxytocic home fish can be used. One or two injections will do. When the water temperature is 22-23 °C, the effect time is 12-14 hours. Artificial insemination method, we must pay attention to grasp the effect of time, accurately determine the estrus time of broodstock, timely catch broodstock for egg collection, sperm extraction, mixing evenly, make it fully fertilized. The hatching methods include natural hatching, debonding hatching, and non-sticking hatching. The commonly used hatching loops can be hatched in incubation tanks and small cages. The incubation water temperature is generally 17-28°C, and the optimum water temperature is 23-25°C. .
(2) Fry cultivation. Fry pond area of ​​25-100 square meters, water depth 0.8-1 m is appropriate. The fry stocking density is 1000-1500 tails per square meter. When the pool is at a proper time, the yolk sac of the fry disappears, and the swimming can be carried out in a timely manner when the swimming level is normal. Feeds for fry can be cooked with egg yolks or small horns and copepods. As the fish grows, you can feed leeches, chironomid larvae, leeches, maggots and various small fry, or feed them. Silkworm cocoon powder, pig blood, artificial feed, etc. It should be noted that fish fry of different ages cannot be mixed in the same pool. The bigmouth owl is a little afraid of light, so it's best to set a cover on the fry pool. 10-15 days of cultivation time, when the fish grows to about 3 cm, they are reared in separate ponds.
(3) Fish breeding. The young fish species with a length of about 3 cm is cultivated to a large-sized fish species of 10–12 cm, which lasts for about 30–40 days. This stage is a critical period for the cultivation of fingerlings. The big oyster must experience the process of being forced to switch from eating live bait to eating artificial feed. At the same time, it is the period of the most severe mutual food. It should be noted that the transparency of the pool water is moderate, and when the water quality is clear, the self-mutilation phenomenon is the most serious. It is necessary to invest in the favorite feed of big oysters, and timely clear the pond and grading in separate ponds. After the fish species reaches 5 cm, artificially prepared transfer feeds, ie, artificial feed supplements with the addition of attractant, are to be fed. The basic components are fish meal, silkworm meal, pig blood meal, yeast meal, pancake meal and wheat. Lure attractants include fish gills, shrimp crab gizzards, and animal liver gizzards. Transfer food process 7-12 days. Daily feeding 2-3 times, feeding amount of 15% -20% of body weight. When 70% of the fish species have been able to ingest artificial compound feed, artificial compound feed can be completely fed twice a day. Compound feed requirements: Crude protein 42% -48%, 8% -10% crude fat, sugar 25% -30%, 6% -8% crude fiber, plus a certain amount of vitamins and inorganic salts. We must strengthen management and prevent diseases.
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