With high water temperature, deteriorating farming environment, and increased feeding and management plus one year old grass carp, the survival of first-year grass carp is facing challenges. Here, some measures to improve the survival rate of first-year grass carp are presented for farmers' reference.
1. Pond clearing. Excavate excess silt (remaining 10 cm - 15 cm) and clear the pond thoroughly with quick lime. Use 75 kg - 100 kg/mu.
2. Reasonable stocking. The first is to choose the water body Cladocera breeding peak to release grass carp summer flowers. Generally put the fertilizer 200 kg -300 kg / acre, 7 days -10 days Zhijiao class that reaches the peak; second is a small amount of picking summer carp, mainly from feeding baits, benthic benthic organisms and food restriction. Generally 1,000 grass carp summer catches carp summer 200 -300.
3. Guarantee high quality natural food supply. The bait is mainly based on Cladocera, Euphorbia, duckweed, etc., and fine materials should be used properly.
4. Change the feeding method to avoid the formation of "bubble head". One is to appropriately increase the number of bait stations and require that at least one of the 5,000 fish species should be set up; second, the feeding should be uniform to avoid undue delay; and third, fish diseases must be properly restricted during the season.
5. Ensure that the water is fresh. One is to flush water in a timely manner, 5-10 cm each time, especially in the hot season 1-2 days to flush once; second is to timely remove dead fish and uneaten residual grass and debris.
6. Pull the net at a proper time and filter out the “bubbleheadâ€, and culture it in a special pool or a fish pond.
7. Pay attention to the prevention and treatment of fish diseases. One is to use grass pulp hemorrhagic tissue pulp inactivated vaccine immersion or injection; the second is every 10 days -15 days of fish disease season with 20 kg per kg -30 kg of lime per pool Quanchiposa; third is every other month with garlic The head smashed by 100 fish species with garlic 1000 grams of mixed feed, each feeding for 3 days -4 days, respectively, to control grass carp bleeding, gill rot and enteritis disease.
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