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Symptoms and Control Methods of Swim Bladder Fungal Disease

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The pathogen is Phoma herbarum, belonging to the subdivision Deuteromycotina, class Coelomycetes. Its hyphae are branched and septate, about 50 micrometers to 100 micrometers long and 2 micrometers to 3 micrometers wide. New cultures on Sabouraud agar are light yellow, gradually turning light pink and finally black as the fungus ages, producing pycnidia, from which colorless, transparent conidia are generated. Symptoms: Affected fish are mostly fry and fingerlings. Diseased fish lose balance when swimming, the anus swells, the fins bleed, and the skin is damaged. In the early stage, only the swim bladder is damaged, with some white

The pathogen is Phoma herbarum, belonging to the subdivision Deuteromycotina, class Coelomycetes. Its hyphae are branched and septate, about 50 micrometers to 100 micrometers long and 2 micrometers to 3 micrometers wide. New cultures on Sabouraud agar are light yellow, gradually turning light pink and finally black as the fungus ages, producing pycnidia, from which colorless, transparent conidia are generated.

Symptoms: Affected fish are mostly fry and fingerlings. Diseased fish lose balance when swimming, the anus swells, the fins bleed, and the skin is damaged. In the early stage, only the swim bladder is damaged, with some white areas 1 mm to 2 mm in size appearing at the front end of the swim bladder. The initial site of infection is around the pneumatic duct, and then the swim bladder cavity fills with hyphae, and the epithelium of the swim bladder wall proliferates. Soon the swim bladder wall is destroyed, thereby infecting nearby internal organs, with acute inflammatory reactions or chronic granulomas, and congestion spots and necrotic areas occur in the affected internal organs.

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