nstantaneous and historical temperature effects on a-pinene
of pH and salinity on pathogenicity of Flavobacteriumcolumnare
andMyxobacterium sp. in Indian cat fish, Clariasbatrachus(Linn.)
Aquatic Biotechnology and Fish Pathology Laboratory,
Department of Animal Science, M.J.P.
Bareilly - 243 006, India
Aquatic Biotechnology and Fish Pathology Laboratory, Department
of Animal Science, M.J.P.
RohilkhandUniversity, Bareilly - 243 006, India
Division of Bacteriology and Mycology, Indian Veteninary Research Institute, Izatnagar
- 243 122,
24 September 2010
Myxobacterium sp. recorded persistently
associated in fish hatchery and culture system of Himalayan and Sub -
Himalayan regions were found to be pathogenic.? The pH and salinity played a significant
role on the pathogenicity of these potent pathogens
in case of Clariasbatrachus
LD50 value of FC was 104.5 CFU in both the fishes and
those of Myxobacteriumsp it was 106
CFU ml-1 fish-1.?
Fish challenged with F. columnare and
Myxobacterium sp. (@ 0.2 ml fish-1)
individually consisting 105-6cfu ml-1 exhibited
explicit symptoms of columnaris disease and marked
with ulceration and saddle back lesion on the dorsal side of body. Maximum reisolation of inoculated bacteria was recorded at pH 7.0
and 7.5 and at 0.0-0.5 (F. columnare) and
0.0-1.0% (Myxobacterium sp.) salinity.
Foregoing results elucidated that F. columnarewas
more sensitive to salinity in comparison to Myxobacterium
sp. and their pathogenicity significantly
(p<0.05) depends on the salinity and pH that might be one of the physical
factors to control their proliferation.
culture, Columnaris disease, F. columnare, Myxobacterium
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