1, fry stocking The day before release, insert a small cage into the pond and put a small amount of fry. If there is no abnormal reaction on the day of observation, you can put the seedling into the pond. The stocking densities depend on the outlet pond size and pond conditions. If it is planned to cultivate 3 to 4 cm of fingerlings, it can put 1.5 to 2 centimeters of seedlings from 1 to 150,000 tails per acre; if breeding 4 to 6 centimeters of fingerlings, put 30,000 to 50,000 tails per acre; For large-sized fish species above 6 cm, 1 to 15,000 tails per acre are placed. The time required has a lot to do with water temperature and weather conditions. It is generally 20 to 40 days. 2, water quality management After the fish seedlings have to be filled with water and fertilized in time, the amount of fertilizer and the interval time must be controlled flexibly according to the water color, floating conditions of the fry and the weather, and the water color should be brown green or oil green. The transparency of the water is maintained at about 20 cm, and an aerator should be provided to prevent floating heads. Under normal circumstances, the young fish ponds should be filled with fresh water for 20 to 30 centimeters for 7 days. Afterwards, appropriate fresh water should be added at the appropriate time. The water quality should be maintained during the whole process of cultivation: “fat, live, tender and coolâ€. 3, bait The key to fry breeding is the reproduction of zooplankton just suitable for the feeding needs of ponds. When the fish fry under the pond, they mainly eat rotifers. Therefore, the number of rotifers in the pond is directly related to the survival rate of the fry under the fry pond and the subsequent outflow rate. Therefore, it is necessary to use the pond with the largest number of rotifers. The source of feed for the cultivation of eel seedlings in Datang is broader, and peanut bran, soybean meal, rice bran, and wheat bran can be fed. Feed 2 to 3 times a day, depending on the weather, water quality, and feeding conditions of the fry. Early cultivation, such as feeding a small amount of protein and other high protein feed, is better. Straw Toothbrush,Wheat Straw Toothbrush,Wheat Straw Toothbrush Set,Eco-Friendly Straw Toothbrush Yangzhou Tongfun Red International Trading Co,Ltd. , https://www.i-ecbio.com
The methods for breeding eel seedlings are as follows: