Abstract

LEON, Jorge; AVALOS, Rita  and  PONCE, Milagros. Flavobacterium psychrophilum and its pathology in alevins of Onchorhynchus mykiss from the El Ingenio fish farm, Huancayo. Rev. peru biol. [online]. 2008, vol.15, n.2, pp.117-124. ISSN 1727-9933.

The present paper reports the presence of Flavobacterium psychrophilum such as pathological agent of "bacterial disease of cold water" on juvenile Onchorhynchus mykiss "rainbow trout" from El Ingenio fish farm, Junín (3250 m). The ulceration of the dorsal area was the most frequent macroscopic external injury as well the localized blackening of the skin. Internally there was a marked splenomegaly, pallor of the liver, kidney and gills, inflammation of the intestine and ascitic fluid in the peritoneum. Internal hemorrhage was not detected. 29 strain Gram negative were isolated in Modified Cytophaga Agar (MCA) (Anaker & Ordal, 1959), which according to the phenotypic characterization and the biochemical tests 9 were considered as F. psychrophilum. Tests of antibiotic susceptibility showed high sensitivity of this strains to Gentamicin, Ceftazidine, oxytetracycline, Norfloxacine, furazolidone, Ciprofloxacine and Cefoxitine.

Keywords : Flavobacterium; Flexibacter; Cold Water Bacterial Disease; rainbow trout.

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