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How can the water color of eel culture ponds be improved?

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During the culture process, the pond water color changes unpredictably, indicating that phytoplankton have died in large numbers, zooplankton such as rotifers and water fleas have increased sharply, dissolved oxygen and pH have decreased, harmful gases have increased, eels have reduced feeding, and floating head has appeared, leading to disease and death. The improvement methods are as follows: 1. Light green turns transparent: This phenomenon is caused by massive reproduction of zooplankton such as rotifers and water fleas. Trichlorfon at 0.5 ppm plus potassium permanganate at 2 ppm can be used to kill excess rotifers and water fleas, or a large water exchange can be used; stock 500 g or more per fish of bighead carp per mu

During the culture process, the pond water color changes unpredictably, indicating that phytoplankton have died in large numbers, zooplankton such as rotifers and water fleas have increased sharply, dissolved oxygen and pH have decreased, harmful gases have increased, eels have reduced feeding, and floating head has appeared, leading to disease and death. The improvement methods are as follows:

1. Light green turns transparent: This phenomenon is caused by massive reproduction of zooplankton such as rotifers and water fleas. Trichlorfon at 0.5 ppm plus potassium permanganate at 2 ppm can be used to kill excess rotifers and water fleas, or a large water exchange can be used; stock 12-20 bighead carp of 500 g or more per fish per mu to regulate water quality.

2. The water color is turbid and slightly yellow: The water quality has already deteriorated. The pond water must be replaced, the amount of feed reduced, and compound fertilizer or urea applied to promote phytoplankton reproduction, while adding fresh water.

3. The pond water color is dark brownish green: At this time the water quality has already aged. Zeolite powder or quicklime can be splashed over the whole pond, and part of the water drained and replaced.

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