The key to aquaculture is prevention, and how to achieve proper disease prevention is a question worthy of exploration. Now elaborate on the following aspects:
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First, adequate dissolved oxygen is a prerequisite for disease prevention.
Adequate dissolved oxygen can ensure the vitality of the fish. In order to ensure the resistance of carp to diseases and insect pests. Adequate dissolved oxygen can degrade the harmful substances in the water, thus reducing the damage to the carp. Carp needs high dissolved oxygen, dissolved oxygen 5 mg/l, and no less than 3 mg/l. Dissolved oxygen in water is mainly determined by factors such as breeding density, temperature, feeding, and aeration machine efficiency. It is not easy to reasonably use oxygen aerators for hypoxia. Must have sufficient dissolved oxygen must do: 1, have sufficient water; 2, appropriate stocking density; 3, the appropriate water disinfection; 4, good water quality management (fat, live, tender, cool, etc.).
Second, have a proper pH.
The proper pH of the water is conducive to the reproduction of plankton, is conducive to the decomposition of organic matter, and is conducive to the absorption of dissolved oxygen by squid. Fluctuations in pH can indicate changes in the environment. When the pH is low, the carbon dioxide in the fish is not easily released into the water, the oxygen exchange is poor, the head is easy to float, and nitrite poisoning is prone to occur. High pH, ​​high ammonia toxicity, and easy to corrode tissues, skin, etc., cause tail and other syndromes, slow growth, more than three types of seedlings. pH also affects the effectiveness of drugs and disinfectants. The pH value in Dianchi Lake is suitable from 7 to 8.5, the pH is stable, the water quality is balanced, and the carp grows fast. The pH can generally be adjusted by means of aeration, addition of alkali (such as quicklime, soda ash, etc.) or acidic agents (such as hydrochloric acid, acidic oxidants). 
