bacterial gill disease
a disease caused by unfaourable environmental conditions which then allow an invasion by myxobacteria; fish show a lack of appetite and cannot school properly. The gills show clubbing and fusion of lamellae
a myxobacterial infection of juvenile salmonids and ictalurid catfishes in aquaculture facilities, often breaking out in spring when the fish are growing and crowded in waters where oxygen is low and ammonia levels high. The gills appear off-white and slimy, clubbed and fused. Causes loss of appetite

Dictionary of ichthyology. 2009.

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