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:
• Observation of microscopic preparations hanging drops (400x) to see the column on the target organ bacterial infection.
• Isolation and identification by bio-chemical tests.
Control:
• Avoiding the occurrence of stress (physical, chemical, biological)
• Reducing the levels of dissolved organic material and / or increase the frequency of replacement of new water
• Through immersion with some chemicals such as
✓ 0.5% kitchen salt or potassium permanganate 5 ppm for 1 day
✓ Acriflavine 5-10 ppm by immersion for several days.
✓ Chloramin B or T 18-20 ppm by immersion for 2-3 days.
✓ benzalkonium chloride at doses of 18-20 ppm for 2-3 days
✓ Oxolinic acid at a dose of 1 ppm for 24 hours
source: Ministry of Maritime Affairs and Fisheries Republic of Indonesia, Directorate General of Aquaculture, Fish and Environmental Health Directorate, 2010
No comments:
Post a Comment