1, open bait fish supply The eggs of salmon carp begin to be stripped after 58 to 68 hours of incubation. The yolk sac was completely absorbed after 90 to 110 hours from the start of the film, and it turned to exogenous nutrition. The head lice should be bred when the squid first appeared to be detached, so that the filming time of the scorpion heads could be synchronized with the squid's opening feeding. This ensures that the squid can eat the puffball pl On the 2nd and 3rd days after spawning, each group spawned a group of head lice, which acted as the open-baited fry for squid. After timing the proofing observation of the density of bait fish and the feeding conditions of the carp seedlings, feed bait seedlings were added in time so that the density of the bait seedlings was maintained at about 10 times that of the carp seedlings. The open-mouth carp diet is 2-7 tails, which is increased by 1-2 tails per day on the 3-day-old 2-tailed basis. After the eel seedlings are opened, a batch of fry is bred every 3 days as a follow-up bait, and it is necessary to ensure that the eel has sufficient feed. The number of eel eggs and the amount of bait are required to determine the batch production batches of the clams, usually 2 to 3 batches. Times. At the same time, the water flow rate is gradually reduced depending on the situation to reduce the physical energy consumption of fry. 2, seed cultivation The larval rearing of carp needs to be carried out in stages. The first level of cultivation is carried out in hatchery facilities and the second level of cultivation is carried out in ponds. (1) In the initial stage of cultivation and cultivation, the density of carp seedlings can be maintained at 1 to 20,000 per cubic meter, and the density of the carp seedlings can be gradually reduced as the individuals increase. The salmon seedlings can be fed with calyx, white peony and grass fry once a week, once a day. When the eel's seedlings grow to 1.5 cm, they begin to be fed with home-made fish. At this time, the ratio of cod seedlings to baitfish is about 1:3. In daily management work, pay attention to adjusting the flow rate, remove dead seedlings, feces and impurities in time, and keep the water body clean. Starting from the start of eel fry, it takes about 15 days to grow to 2 cm. (2) Secondary cultivation When the eel fry grows to 2 cm, if it is still cultivated in the hatchery, the density is too high and the growth is affected, which also increases the difficulty of management. It should be transferred to a pond that has been previously cultivated with bait fish for secondary cultivation. The stocking density is generally 3,000 to 4000 tails per mu. The first 15 days using the original pond bait fish, after the fish according to the bait feed density increase feed bait fish, the bait fish feed all after disinfection, strict control of pathogens into. It takes about 7 to 10 days to grow from 2 cm to 3 cm, and it takes 15 to 20 days to grow to 5 cm. 3. Disease prevention and treatment The egg hatching and seedling cultivation stage of carp is the stage of fish disease proneness, especially the parasitic diseases such as trichoderma, oblique tuberculosis, and polyparia, etc. occur frequently, and are checked every 2 to 3 days. If it is found that the squid swimming is slow, unable to prey, or the bait fry is not reduced in density within a certain period of time, or if the reduction is not significant, the carp seedlings may be diagnosed as suffering from parasitic diseases.
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The common method is to use copper sulfate for control. Before the use of drugs, stop the water exchange and activate the oxygen pump so that the concentration of copper sulfate in the water can be kept at 0.7 mg/l. After 2 hours, the valve is changed and the efficacy is examined by microscopy. Severe illness can increase the concentration to 5 mg/L bath for 10 minutes. Formalin can also be used at a concentration of 200 mg/l. 