What month is suitable for fry?

Late May to mid-June is the best time to stock fry.

One or two months after the Chinese New Year, or July and August.

Pay attention to the following points when releasing fry:

Cleaning and disinfection of ponds:

Fry enter tang qian for 65,438+08 days to 65,438+05 days, 60 kg to 65,438+000 kg of quicklime or 65,438+03.5 kg of bleaching powder are added to each mu, and then the whole pond is sprayed with water for disinfection; The toxicity test of clean pool water was carried out. Methods: the day before the fry were released, several fish were put in the cage of the fish pond and observed for 6 ~ 8 hours. If the fry are normal, they can be released.

Apply enough base fertilizer:

Inject 50 cm to 60 cm of water about a week before the fry go into the pond, and fertilize the pond to cultivate palatable natural bait for the fry. Generally, 300 kg to 400 kg of decomposed human manure or pig manure is applied per mu, and the transparency of the pond water is 30 cm to 40 cm, and the water color is brown, oily green or light yellow, which is the best time for fry to enter the pond. If a large number of copepods, cladocera and red worms appear after fertilization, they should be killed with 90% crystal trichlorfon at 0.4ppM. When phytoplankton proliferate in large quantities and there are too many green algae, fry are prone to bubble disease, and fry should be filled with fresh water before entering the pond.

Fried socks:

You should choose healthy, neat, healthy and disease-free fry. Identification method: put the fry in a porcelain basin, and those who struggle violently and bend their heads and tails are strong fry. Before stocking the fry, put them in a plastic basin. Crush the yolk, dilute it with water, filter it with a 40-mesh polyethylene net, and sprinkle it evenly into the basin. Feed 2 ~ 3 egg yolks per 10,000 fry. After the fry are full, put them in the fish pond. Stocking density: the stocking quantity per mu of Wuzi Fentang is 654.38+0.5 million ~ 200,000; The stocking amount of flowers in the pond in summer is 6.5438+10,000 to 6.5438+0.5 million per mu. The same batch of fry, especially grass carp and carp, should be put in the same pond, and large and small fry should never be kept in sets. You should choose sunny weather to release the fry. When releasing the fry, you should stand in the wind and release them slowly, so that the fry can swim into the water, otherwise the survival rate of the fry will be reduced.

Adjust the temperature difference:

The temperature difference between the water containing fry and the pool water before entering the pool shall not exceed 2℃. If the temperature difference is too large, it is necessary to adjust the water temperature of the fry to be basically the same as that of the pond before releasing the fry. The fry transported in plastic bags should be "cooled" 1 hour on the water surface before the next pond can be opened.

Timely water injection:

When the fry enter the pond, the water depth is 50cm ~ 60cm, and then water is injected every 3 ~ 5 days, with each water injection of 10cm ~ 15cm. During the culture period, water should be added for 3 to 4 times, and the final water depth is 1 m to 1.3 m, and the water injection time should not be too long each time, so as to avoid the fry from flooding for a long time and affecting their physique. When injecting water, attention should be paid to using dense mesh filtration at the injection port to prevent wild miscellaneous fish and enemy creatures from entering the pond with the water. At the same time, it will not let the water flow on the mud at the bottom of the pool and muddy the pool water.