In April, the temperature rose, but the amplitude was quite large and the water temperature was extremely unstable. Its main fishing activities are to continue to do well in the breeding of cockroaches and sturgeons; to strengthen the management of sturgeon and cockroach seedlings and adult fish; to prepare for the natural breeding and artificial reproduction of the four major fishes; to adjust the water quality and reduce the occurrence of diseases.
1. Continue to do the work of breeding eels and eels. Keep a close watch on the weather forecast. When the water temperature stabilizes above 18°C, continue to do the self-propagation and artificial propagation of squid and squid.

2. Strengthen breeding and management of eel and eel. Select suitable breeding ponds with appropriate area, moderate water depth, flat bottom, and adequate light. The fry pool is generally suitable for 1-3 mu and the water depth is 1 meter, and 15-20 million tails per acre. Fish breeding ponds are generally suitable for 3-5 mu and a water depth of 1.5-2 meters, with 1-20000 fry per acre.

3. Strengthen the cultivation and management of the broodstock of the four major fish (blue, grass, oyster, and clam). April is a crucial period for the cultivation of fish and broodstock. It is necessary to strengthen feeding and management, feed enough feed to ensure feed quality, use biological agents to regulate water quality and promote food reproduction, increase the frequency of flushing, stimulate water flow, enhance fish appetite, and promote Gonadal development; regular inspection of broodstock, promptly grasp the gonad development status of the broodstock, predict the date of production, and prepare for artificial reproduction.

4, to strengthen the feeding management of adult fish. As the water temperature rises, gradually increase the amount of feeding, so that positioning, timing, quantitative, qualitative feeding, timely new water, provide a good living environment for fish. After the climate is stable, tropical fish such as tilapia and Macrobrachium rosenbergii can be transferred out of the wintering pond for monoculture or polyculture.

5, regulate water quality, strengthen the prevention and treatment of fish diseases. Each half a month, quicklime (30 g/m3 water body), or photosynthetic bacteria (as per the manufacturer's instructions), or chlorine-containing preparations (0.3 g to 5 g) such as trichloroisohydrouric acid are alternately used to adjust water quality and kill pests and diseases. Focus on the prevention and control of water mildew, punctured fleas, fulminant bacterial infectious diseases, and bacterial rot disease.

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