1. Check the efficacy of the clear pond drugs before the fry. Dozens of fry were placed in cages in the pond, and half-day to day-long observation of fry activity was normal. After about 7 days of clear ponds, the efficacy basically disappeared.
2. Before the fry are released, use a dense mesh net to empty the pond 1-2 times, and clean the harmful insects, frog eggs, cockroaches and wild fish in the pond after clear ponds.
3, fish should be timely pond. Premature tender seedlings, poor feeding and activity, weak vitality, survival rate after the pool is not high; too late, Miao Lao, yolk sac has been absorbed, the body because of lack of nutrition and weight loss, poor health, but also easy to die. Should be mastered in the hatching of fish fry for 4-5 days, when the turtle is inflated and can swim normally and eat outside food, the pond should be promptly removed.
4, fry to choose sunny pond. Sunny days have high temperatures, and the vitality of fry is strong, which is conducive to normal growth. On rainy days, the sudden drop in temperature, abrupt changes in water temperature, and reduced vitality of fry, especially in rainy days, the shallow concentration of fry on the water in the foot of the beach consumes both physical strength and can not eat in time. Cause wilting and morbid death. The author believes that if the fish ponds are good for two or three sunny days, the survival rate of summer flowers will increase significantly.
5, fry to eat after the next pond. In order to improve the health and vitality of the fry, on the afternoon of the day before the seedlings are laid, each side of the fry is fed with two cooked egg yolks, wrapped in gauze, crushed, washed into egg yolk to feed the fish, and then fed the next morning, the egg yolk will increase to 4, at noon will be able to emerge under the pond.
6, to choose the same batch of the same kind of fry. On the windy day, the winds will be raised in the upwind position to prevent the seedlings from being blown to the edge of the pool to death. If fry are transported from other places, especially those fed by nylon bags, the temperature of the water in the bag and the temperature of the pond should not exceed 4°C. The nylon bag can be opened first, the bag can be placed in the pond, and the pond water can be appropriately placed. Tens of minutes later, the temperature of the water was basically the same and the seedlings were put into the pool.
7, when the seedlings should be ready to count, stocking density of 10-15 million per acre is appropriate, can be adjusted according to different varieties. Green and grass fry are more thin and some of the clams and trout are more dense.
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