A Detailed Guide to Fish Pond Disinfection Methods and Precautions

Fish pond disinfection is a fundamental management task in aquaculture, referring to the process of removing pathogenic microorganisms from pond water and bottom mud through physical or chemical means. After a pond has gone through one farming cycle, leftover feed, feces, and dead plant and animal matter accumulate continuously, making it easy for bacteria, viruses, and parasites to breed. Therefore, regular disinfection is crucial for preventing fish diseases and increasing survival rates.

In terms of timing, fish pond disinfection is generally divided into two types: pond clearing and disinfection before fry release, and water body disinfection during the farming process. Pond clearing and disinfection is mostly carried out after the pond water has been drained, commonly using quicklime, bleaching powder, and similar substances broadcast over the entire pond, combined with sun-drying the pond bottom; for routine disinfection, relatively mild disinfectants such as chlorine dioxide and povidone-iodine are often chosen, diluted according to the instructions and evenly broadcast to avoid irritating the fish.

When disinfecting, pay attention to changes in weather and water quality. Generally, choose a clear morning to carry it out, avoiding periods when fish are gasping at the surface or when the weather is hot and muggy. After applying the treatment, aeration equipment should be turned on, and the fish's feeding and activity should be observed. If abnormalities appear, fresh water should be added promptly. The dosage of disinfectant must be strictly controlled; an overdose will damage the water body ecology and instead affect the normal growth of the fish.

Besides using chemicals, many farmers also use physical methods such as pond drying, freezing the pond, and dredging to assist disinfection, reducing reliance on chemical agents. A scientific and reasonable disinfection schedule, combined with regular water changes and daily feeding management, can effectively reduce the occurrence of disease and is a fundamental part of raising fish well.