FISH CULTURE

Columnaris Disease Cause: Flavobacterium columnare or Fexibacterium columnare Bio-Ecology of pathogens: • Bacteria gram negative, small rod-shaped, movable slide, and there in freshwater ecosystems. • The nature of these bacteria are grouped to form a collection such as the column. • The attacks often occur in groups of fish after transportation. • The nature of the attacks are generally sub-acute - acute, when the dominant gill as a target organ, the fish will suffocate and the resulting deaths could reach 100%. Clinical symptoms: • sores around the mouth, head, body or fins. Brownish white sores then develop into ulcers. • infection around the mouth, looks like the lining of yarn (thread-like) so it is often called the disease "mouth fungus". • All around the wound is covered by the bright yellow pigment. • If the infected gills, damage starts from the tip of the gill filaments and spread to the base, filaments eventually rot and fall out (gill rot). Diagnosis: • Observatio