How to raise herring in winter

Herring culture mainly pays attention to increasing temperature and preventing cold in winter, because the air temperature is low in winter, the dissolved oxygen in the water decreases relatively, while the water surface freezes, which lowers the water level and increases the density of herring in the pond, so it is necessary to ensure that there is a certain water level in the pond in winter. during this period, oxygen-increasing equipment can also be used, and relative measures should be taken to avoid cold and increase temperature because of cold weather in winter.

I. Winter hazards

Herring generally lives in the middle and lower layers of the water, mainly eats snails, clams, clams, etc., and also feeds on shrimp and insects. Herring grows fast and has a large volume, with a maximum of about 70 kg for adults. However, the living environment and physiological state of herring will change greatly in winter. When overwintering, the pond water is shallow and the temperature difference changes greatly, which is disadvantageous to the growth of herring. After the water level drops, the fish density will relatively increase. It will cause anoxia to stop the development and even death of herring, so the water level of herring pond should be kept normal in winter.

II. Preventive measures

The illumination time in winter is relatively short, while the photosynthesis of phytoplankton in water decreases, resulting in a decrease in oxygen production and insufficient dissolved oxygen in culture water, so oxygen-increasing equipment should be used in time in winter, and herring is vulnerable to cold injury because of cold weather in winter. relative measures should be taken to avoid cold and increase temperature.

1. Set up barriers to avoid the cold: pile in the north of the fish pond, and then put grass curtains or woven bags as a barrier to reduce the attack of the cold current.

2. Manure heating: about 500 kg of rotten livestock and poultry manure in the pond can be used to raise the temperature of the water by using the heat released by fertilizer fermentation.

3. Make a fire for heating: due to the strong north wind during the winter day, there will generally be frost at night. During this period, wet straw can be used to light a fire on the bank of the pond to raise the temperature so as to reduce frost.

4. Put in aquatic plants: put an appropriate amount of aquatic plants into the fish ponds in winter to keep the herring from the cold in the grass.

5. Release water to increase temperature: you can choose to put the water from the shallow pond with relatively high water temperature into the fish pond at noon on a sunny day with high air temperature to increase the water temperature in the pond.

In order to enhance the physique of herring in winter and improve its disease resistance and cold resistance, it is necessary to feed carefully before winter, enhance the fat thickness of herring, select and cultivate cold-tolerant and high-quality varieties, and pay attention to disinfecting fish bodies to reduce sick and injured fish. Improve the winter environment and survival rate of herring, ensure that fresh water is put in in winter, clean up excess silt and weeds, and take measures to eliminate pests and prevent escape.