High-quality and robust fish species are the cornerstones of adult fish farming, but for the cultivation of adult fish in the northern region, they have to face the real problems of winter cold. Fry no matter how good it is, if there is a problem in wintering management, fish species will suffer from frostbite, long parasites, lack of oxygen, suffocation, flooding ponds and other diseases, which will seriously affect the health of the fish species and later growth.
Raising the health and survival rate of fingerlings after winter is directly related to the actual production problems such as growth rate, disease resistance, and feed cost during adult culture after winter. Therefore, the management of wintering of fingerlings becomes a very important link in the production of adult fish.
Preparation before winter
Choosing a suitable wintering pond: Overwintering ponds of fish species should be selected in accordance with the conditions of leeward sunny, east-west oriented, depth 2.2 meters or more, area 5 mu to 10 mu, sufficient water supply, and not easy to freeze.
Disinfecting fertilizer water before clearing winter before wintering: Before putting fingerlings, they must be suntan for one week to check whether there is water leakage in the pool, remove weeds, garbage, etc., which are contaminated with water, and disinfect and sterilize with fish and shrimp. Days ~ 5 days after the use of fertilizer tyrant + fertilizer + bacteria tyrants mix soaked 2 ~ 5 hours after the Quanchiposa fertilizer and water, but also for the upcoming release of fish species palatable natural food.
Strengthen nutrition: Before putting the fish into wintering ponds, it is necessary to intensify the feeding of high-protein compound feed for half a month to improve the fish's plumpness and enhance the physical quality, and to reserve materials and energy for the coming winter.
Ice Management
Overwintering fish species stocking: Overwintering species are stocked with 500 kg to 1000 kg per acre of water. The overwintering fish species in the same pond should be uniform in size and should be put in as many times as possible. Fish species should be soaked with mildew or saline for 10 minutes to 20 minutes to prevent infection due to injury caused by pulling the net.
Appropriate feeding: When the water temperature is above 4°C, it should be fed every 2 days to 3 days at sunny noon.
Timely topdressing: In winter, the water temperature is relatively low, and phytoplankton propagate slowly. If fertilizers are not applied in time, it is not conducive to phytoplankton reproduction. At the same time, because of the decrease in the rate of photosynthesis, the overwintering ponds that are already deficient in oxygen reduce the source of dissolved oxygen. , Maintaining proper fatness can also play a role in keeping warm. Therefore, the wintering pool of fish species should be added in an appropriate timely manner in the winter season.
Exchanging water in a timely manner: Before the winter, add the pool water level to the highest water level, generally not less than 2 meters, and regularly replace the water according to the water quality, and pay attention to measuring the water temperature and paying attention to the weather forecast, predicting the cold air, cold wave and heavy snow in advance, etc. The arrival of inclement weather prevented the occurrence of an oxygen-depleted flooding pond accident in case the iced water could not be discovered in time.
Disease prevention and control: prevent the treatment due to pull net injury is not timely and secondary infection Shuimu mold, oral filariasis, trichoderma disease, oblique tuberculosis, vertical scale disease, etc., if any disease, coping therapy.
Ice Age Management
Timely ice-reinforcing and oxygen-increasing: After the wintering pond is frozen, it is necessary to play the ice hole or add water to melt ice in a timely manner, which is conducive to observing the activities of the species and the quality of the water, and it is also beneficial to increase the dissolved oxygen in the water to prevent the occurrence of oxygen-depleted flooding ponds, etc. ACCIDENT. There should be no less than three to four ice caves that hit 0.5 square meters per acre of water.
Timely removal of snow: Covering the ice surface will not only affect the light transmission, but also affect the photosynthesis of phytoplankton in the water and affect the production of dissolved oxygen. Therefore, the snow and dirt on the ice should be promptly removed after the ice is sealed and snowed.
Regularly check the water quality: Measure the content of harmful substances such as ammonia nitrogen, nitrite, and hydrogen sulfide in the water every 5 days to 10 days. If water quality deteriorates, change the water promptly and take measures to improve the water quality.
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