Reservoir repair is very important management techniques of aquaculture in winter

Aquaculture

In winter, aquaculture is basically in a recuperation period, which is the most idle season in the process of aquaculture in a year, but this does not mean that the work in this period is not important, if we do not pay enough attention to the management during this period, it will greatly affect the efficiency of aquaculture in the coming year, so aquaculture in winter should seriously grasp the following management techniques.

1. Renovate and clear the pond. For ponds that have been dried, excessive pond mud should be removed in time, and the reinforcement and leakage should be repaired in winter, followed by thorough pond cleaning and disinfection, which can be sprinkled with quicklime throughout the pond, 75 kg / mu of dry pond and 150 kg / mu of water.

2. Classification of merging ponds. For the ponds of farmed fish species, the ponds should be merged as soon as possible, and all kinds of fish species should be classified and cultured in different fish ponds, so as to facilitate the fishing and sale of fish species in the future, and reduce the mechanical damage of fish species.

3. Put in the fish seed. For dry ponds in winter, fish species should be released as early as possible. Fish species released in winter are not easy to be damaged, the transportation is safer and the survival rate is higher. Fish fry should be disinfected when they are released, and usually soak in 3% salt water for 5 minutes.

4. Feed. In winter, most farmers stop feeding, thinking that fish will not eat at this time, in fact, this is a mistake. According to expert experiments, most fish will eat when the water temperature is above 8 degrees. Therefore, we should still feed in winter, it is best to feed some nutritious and comprehensive formula feed, but the amount should not be too much. Generally, it is fed at noon every 2-3 days, and the daily feeding amount is 0.5% of the body weight of pond fish. If the weather is fine continuously, the feeding amount can be increased appropriately. This is very good for fish to survive the winter.

5. Prevention and treatment of fish disease. The prevention and treatment of fish disease should follow the policy of "no disease first prevention, early treatment of disease", generally disinfect the food farm every 15 days or so, such as disinfection with bleach, its dosage is 0.5-0.75 kg. At the same time, the residual bait and residue of the food farm should be removed regularly. Strengthen pond patrol and timely diagnosis and treatment of fish diseases.

6. Water quality control. If the water temperature is low in winter, the water level will be increased to about 2 meters, and when the water level drops by 20 cm, new water should be added in time to maintain the relative stability of the water level and water temperature. Change the water every 20 days or so, 10% Mur20% each time, and maintain a transparency of 30-40 inches. Quicklime is used every 20-30 days, the dosage is 10-15 / 667, and the ph value is 7.5-8.5. Start up and add oxygen for 2-3 hours at noon on a sunny day to keep the dissolved oxygen in the pool water above 5mg/l.