Preventive Measures for Bacterial Gill Rot, White Liver Disease, and Other Conditions in Mandarin Fish

2026-06-05

Area: 60 mu, water depth 2 meters

Water quality: nitrite 0.05, ammonia nitrogen 0.3, pH 8.2

Date: October 6, 2024

Location: Mugang Town, Yangxin County, Hubei Province

Cultured species: Mandarin fish

I. Problem Description

Around October, temperatures gradually decline and become unstable, creating favorable conditions for the proliferation of pathogenic microorganisms in the water. Coupled with frequent feeding intervals and inadequate timely management of water quality and bottom‑sediment conditions, fish are prone to bacterial infections—such as gill rot—when weather turns unsettled. Clinical signs include pale, eroded gill filaments covered with slimy mud, a whitened liver, and reduced hepatic blood supply. Microscopic examination of the gill filaments reveals no parasites; the condition is bacterial gill rot, often accompanied by a white liver.

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II. Solution

If gill rot is caused by parasites, insecticidal and disinfectant treatments must be applied first.

If the cause is a bacterial infection, on the first day apply Bishui Jiedu’an (Enhanced Formula), 5-liter bottle per 30 mu, to optimize the water quality. The following day, use Zhongren Jiniod + Shuanghuang Essence at a rate of 5–6 mu per bottle to disinfect the entire pond.

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III. Feedback on Results

Three days after chemical disinfection, the solitary diseased fish along the pond’s edge had largely disappeared, with their numbers gradually declining until they were completely gone.

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