As the temperature and water temperature rise gradually, the pond fish that have passed the winter winter begin to feed and the gonads develop and mature rapidly. But at the same time, due to cloudy and mildew fog and fog, the weather often occurs, the light is insufficient, the pressure is low, and the water quality of ponds after winter is generally in an aging state. The lower layers of water often accumulate excessive nitrite, ammonia and other toxic and harmful substances. Poor water quality can easily lead to lack of oxygen in fish ponds and fish floating heads. Therefore, grasping the management of fish ponds in spring and maintaining a good water quality environment in fish ponds can effectively promote the early feeding of fish, restore constitution, enhance disease resistance, and effectively promote the development and maturation of gonads. For the year-round fishery production, it plays a vital role. Here, we must remind farmers in particular to pay attention to the following aspects:
First, pay attention to broodstock breeding:
1. Improve the water quality of fish ponds in a timely manner, rationally feed high-quality feed, and strengthen the cultivation of broodstock. After the winter, the broodstock fish ponds are usually in an aging state and have weak acidity. Therefore, when the fish pond water temperature gradually rises and stabilizes to 13 to 15°C, the fish pond water quality is treated. The specific methods are as follows: (1) change the whole pond to 1/3 of the fresh water; (2) reduce the pond water level appropriately to facilitate the rapid increase of the pond water temperature; (3) when the weather is fine, open the aerator for 1 to 2 hours at noon. (4) If necessary, use lime or microbial preparations to improve the water quality of fish ponds.
2. Eat early to accelerate gonad development in broodstock.
3. Take care of the pond to avoid floating heads. The broodstock in spawning has relatively high oxygen consumption, and it is necessary to maintain a high dissolved oxygen content (4 to 5 mg/l) in fishpond water, otherwise it will affect the development and maturation of the broodstock. Once the pool water is deprived of oxygen, the broodstock appears floating head, which will affect the maturation, spawning of the broodstock, and even cause the broodstock to fail to produce, which will seriously affect the production throughout the year.
4. Strengthen flushing and promote broodstock development. When the water temperature is stable above 15°C, the stimulating water flow to the broodstock will help the broodstock develop and mature and help the mature broodstock to lay eggs successfully.
5. Effectively control the occurrence of fish diseases and strictly control the amount of pesticides applied to the pro-fish ponds. After the winter broodstock, some broodstock may suffer from frostbite and get brucellosis. The dead and diseased fish should be removed in time to avoid polluting the water quality. In order to prevent waterborne mildew, we must use water in the mold net (100g/mu.m) in time. And strictly control the amount of drug applied to the pro-fish pond. Excessive application of pesticides and excessive application of pesticides will affect the maturation of the broodstock and even affect the quality of fry produced by spawning.
Second, pay attention to adult fish rearing:
1. In the spring season, cloudy and mildew rain often occurs, the air pressure is low, and the water body is prone to lack of oxygen. At this time, the main points of water quality management are: stepping up the pond, paying attention to the floating phenomenon of the fish pond, and promptly opening the aerator to increase oxygen; timely Fish ponds were replaced and fresh water was added. Depending on the deterioration of fish pond water quality, whole ponds were splashed with lime or microbial preparations were used to improve the water quality and maintain a good water quality environment for the fish ponds.
2. After the spring, the water temperature of the fishpond gradually rises, and the fish begin to ingest food. At this time, they should eat early, feed fresh and high-quality feed, ensure the fish can eat early, promote the recovery of constitution, and enhance the resistance to disease. Promote the growth of fish and increase aquaculture production and benefits.
3. Do a good job of preventing and curing diseases. After winter, some fish may suffer from frostbite and other diseases such as water mildew, and the following methods can be used to prevent water misty mildew: (1) water mildew net (100g/mu.m) full pond spilled; (2) splashed with whole Chinese medicinal herbs pond, It is advisable to set the pool water concentration to 4ppm.
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