1. Pay attention to adding water and changing water. In order to ensure the smooth wintering of fish species, attention should be paid to adjusting water quality. Before winter, the pool water is added to the highest water level, generally should not be less than 2 meters, usually pay attention to add water according to the water quality, and pay attention to measure the water temperature. When the pool water temperature is low and the water temperature of the exogenous source is higher than the pool water, some pool water should be drained. Appropriate amount of new water to increase the pool water temperature, delay the freezing time, and promote the growth of fish species.
2. Adhere to reasonable feeding, ensure nutrient supply The traditional breeding method is not feeding during the winter, so the fish species will often die due to too much nutrients in the body and no timely supplements. In order to ensure the smooth wintering of the species, reasonable feeding should be maintained to ensure the supply of nutrients. In general, as long as the fish are fed, feed should be fed. In sunny weather, the fish can be fed once every 1 to 3 days. The daily feed amount can be 1% to 2% of the fish's body weight. After the ice is sealed, a small amount of fine material can be put in the ice hole to facilitate timely feeding of the fish.
3. Top-dressing Fertilizer The winter top-dressing is not only beneficial to the reproduction of phytoplankton, but also increases the dissolved oxygen, and it can appropriately play the role of warming and heat preservation. Therefore, in the winter, pay attention should be paid to the top-dressing of the fingerling pool. The top dressing is preferably organic fertilizer, which is usually applied every 15 to 20 days. Each mu can be fermented with 100 to 200 kg of beef and pig manure, and can be flexibly controlled according to the water quality.
4. Disease Prevention and Treatment The most common disease in winter fishes is saprophytic disease, most of which are caused by injury to the fish or cold due to low water levels when ponds or fish species are stocked. Therefore, we must try to avoid injury to fish, and ponds and stocking operations carefully and carefully. Before stocking, soak the fish body with 3% to 5% of salt water for 10 to 15 minutes; pay attention to maintain the water level, keep the water level too low and freeze-dried fish species . Once the disease occurs, 40% of the formaldehyde solution can be splashed across the pool to make the pool water concentration 0.510-6. Can also be used per acre with 10 kilos of tobacco stalks, salt 5 to 7 kilograms of drowning 10 to 20 kilograms Quanchiposa, once a day, with 2 to 3 days. In addition, fish species are also prone to oral filariasis, trichoderma, benomychorchosis, and vertical scale disease in the winter, and should be observed at ordinary times. Fish diseases should be observed and effective measures should be taken in time for treatment.
5. Strengthen other managements In the winter in northern China, there will be different ice-sealing periods. To ensure smooth wintering of fish species, the following tasks should be done during the ice-sealing period:
Playing ice caves: playing ice holes can help to observe the activities of the species and the quality of water, but also help increase the amount of dissolved oxygen in the water. Each mu of water surface can play 0.5 square meters of ice caves 3 to 4.
Sweeping snow: If there is snow or other dirt on the ice surface after sealing the ice, it will affect the light transmission, affect the photosynthesis of phytoplankton in the water, and affect the production of dissolved oxygen. Therefore, snow and dirt should be removed from the ice immediately after the ice is sealed.
Dissolved oxygen, anti-poisoning: The amount of dissolved oxygen, ammonia nitrogen, and nitrite, hydrogen sulfide, etc., can be measured every 10 days. Water quality is found to be poor, and water changes or other measures must be taken to improve water quality.
In short, during the wintering of fingerlings, management should be strengthened in all aspects in order to increase its survival rate.
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