The cultivation of fingerlings is a key part of fish farming. Whether or not the safety of fish seedlings can be done is related to the success or failure of fingerling cultivation. Therefore, the following ten requirements must be fulfilled before the fish fry ponds: Strong seedlings and lower ponds: In order to improve the survival rate of fry ponds, we must choose the high-quality fry ponds with strong physique, neat specifications, and lively swimming. Safe lower pond: Before the fry in the pond, we must strictly check whether the clear pond drug has completely failed. Dozens of fry can be placed in cages in the pond to observe the day and night to see if there are any abnormalities in fry activity and feeding conditions. If there are abnormal phenomena such as restlessness, floating head struggling, and string excursions, there are residues in the clear ponds. Should wait until its efficacy has completely disappeared before going down the pond. Harmless pond: As the fry is small, the ability to resist the enemy's biological damage is weak. Before the fish pond is under the pond, the net must be used to drill the net 1-2 times to remove the harmful insects and frog eggs in the water. The predator organisms, such as cockroach and wild fish, which may harm the fry, are cleared to ensure the safety of the fry. Timely ponds: The time of the ponds is too early, the fishes are too weak, their vitality is poor, and their survival rate is not high. The time of the lower pond is too late, and the yolk sac of the fry has been absorbed. The physical quality is poor, and it is easy to cause the death of the fry under the pond. The time of the lower pond is 4-5 days after the hatching of the fry, and it is best to be able to freely swim and eat food. Sunny ponds: It is best to choose a pond at noon on a continuous sunny day. At this time, the fry adapts to the environment quickly and has the highest survival rate. In the afternoon of the first day of Xiatang, 20,000 fish fry were fed with 2 cooked egg yolks. The cooked egg yolks were wrapped in gauze, crushed, and washed into egg yolk to feed the fish. In the morning, one more meal was fed and the egg yolk increased to 4 and it could emerge at noon. The same batch of Xiatang: each time the fish in the pond must be the same species of fish fry cultivated in the same batch. It is forbidden to mix fry with different sizes and varieties, which will seriously affect the survival rate of the fry. Temperature-regulating ponds: For fry from other places, especially those fed by nylon bags, the nylon bag can be opened first and the bag can be put into the pond due to the large temperature difference between the water temperature in the bag and the pond water temperature. Add some pond water properly, and after tens of minutes wait until the temperature inside and outside the bag is basically the same, then put the seedling into the pool. Look at the wind under the pond: when the wind when the fish pond should be selected in the upper outlet, should not be placed in the wind down seedlings, in order to prevent the fry to the edge of the pool by the wind to death. Disinfect the pond: When using the fish seedlings in the pond, try to use an aqueous solution of salt, potassium permanganate and other drugs to disinfect the fry before treating the pond.
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