Flavobacterium branchiophilum

ALSO KNOWN AS: BGD

Flavobacterium branchiophilum is a Gram-negative, filamentous bacterium responsible for bacterial gill disease (BGD). It infects the gill epithelium, leading to excessive mucus production, respiratory distress, and tissue damage. Affected gills may appear swollen with fuzzy margins and filamentous bacterial growth.

Distribution: Worldwide in freshwater environments.

Hosts: Various freshwater fish species, particularly in aquaculture.

Detection Methods: Bacterial culture – Cytophaga agar.

Target Tissue: Gills.