CLINICAL AND BACTERIOLOGICAL STUDIES ON MYXOBACTERIA INFECTION IN SOME AQUARIUM FISHES
Soad S.A. Salama
Animal Health Research Institute, ARC, Ministry of Agriculture, Dokki, Giza.
Received 31/ 5/ 2010 Accepted 29/ 6/ 2010
Flavobacterium columnare was isolated from five freshwater diseased ornamental fish spp., Guppy (Poecilia spp.), Mollies (Poecillia spp.), Goldfish (Carassius auratus), Koi (Poecilia spp.) and Swordtail (Xiphophorus spp.) in Egypt. The main clinical signs of infected fish were respiratory manifestation, yellowish brown or white lesions on the gills and skin, fin and tail rot. Flavobacterium columnare is a thin Gram-negative yellow rod bacterium belong to genus Flavobacterium characterized by spreading colonies on Anacker and Ordal,S media. The isolated Flavobacterium columnare proved its sensitivity to Nalidixic acid; oxytetracyclin and Erythromycin while it was resistant to Neomycin and Ampicillin.
Experimental infection using immersion method by 24 hr. old broth culture of isolated Flavobacterium columnare proved 100%, 90%, 20%, 40% and 60% mortalities with the ornamental fish spp. Guppy, Mollies, Goldfish, Koi and Swordtail respectively.
Treatment trail with Potassium permanganate at 2 ppm bath or Oxytertracyclin proved effectiveness with Koi spp. in preventing infection spread.