What should be paid attention to in farming grass carp in the north?

Grass carp is the most common aquaculture project, it grows fast, the individual is large, the meat is very delicious and tender, and the culture is very low. It is the most common species in Chinese fish culture industry. However, it will also be accompanied by some shortcomings, such as high incidence of diseases and low survival rate, which have a great impact on the yield of grass carp and the economic interests of farmers. Especially in the dry and low temperature environment in the north, what do you need to pay attention to in farming in the north? Let's have a look!

1. Pond stocking

First of all, two ponds should be prepared, one for the experiment and the other for formal breeding after the experiment. The area of the test should be determined according to the amount of farming, but the general depth is about 1.5-2 meters, and the best source of water is reservoir water. The fish fry put into the experimental pond shall not exceed the range borne by the fish pond according to the previous quantity.

2. Feeding and management

Half a month before the fry is officially released from the experimental pond in spring, the pond should be dry-cleaned with quicklime, using about 10 kg per 70 square meters. And before entering the pond, it is necessary to inject at least 50cm into the pond, and new water is injected into the pond every half a month. And fish fry to choose disease-free, strong, neat specifications of fish fry, it is best to soak in salt water for a few minutes before putting into disinfection. Feeding uses conventional sound domestication methods to let all fish surface for food within 4 days.

3. Management

In the experimental pond, it is necessary to use low-protein and high-fiber feed together with grass feed. Feed can use organic feed such as green bean meal, soybean meal, fish meal, corn and multi-dimensional inorganic salts, but note that the crude protein content in the feed should be at least 10%. Feed at least three times a day, once in the morning, once in the evening, each time within 2-4 hours, every night to pay attention to the residual feed on the water surface to prevent deterioration and pollution of water quality affecting the disease of grass carp.

4. Water quality

The water quality of the pond must be fertile, and it needs to be "fat and tender". The water quality is fresh, the best PH value is about 7, and the picture in the water can be seen clearly at a distance of at least 30 cm. As the temperature rises in summer, the water temperature will gradually rise, so in order to prevent the aging and deterioration of the water, it is necessary to release at least 20 centimeters of water from the pond every half a month and add new water. Keep the water fresh and record the water temperature and food intake every day.

5. Disease

Because grass carp live in the water, if the disease can not be detected in time or even come to the surface after death, so fish disease is mainly based on prevention. In the case of high-temperature and rainy bacteria in summer, it is necessary to add an appropriate amount of antimicrobials to the feed to prevent diseases. From the beginning of July, quicklime should be sprinkled in the pond every half a month for disinfection, and the feed should be preserved and disinfected accordingly.

Grass carp disease is the most difficult to find, living in the water, can not timely observe the situation of grass carp, there is no way to know whether there is a disease. Therefore, disease is the biggest headache for the fish culture industry, and we must do a good job in prevention. Do a good job of pond disinfection, do a good job of changing water and fertilizing frequently, reduce all possible sources of disease, reduce the incidence, and improve the survival rate of grass carp.