Premium
A study on Flexibacter columnaris infection in loach, Misgurnus anguillicaudatus (Bleeker, Günther)
Author(s) -
CHOWDHURY M. B. R.,
WAKABAYASHI H.
Publication year - 1991
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/j.1365-2761.1991.tb00837.x
Subject(s) - misgurnus , biology , microbiology and biotechnology , fish <actinopterygii> , fishery
. Infectivity of Flexibator columnaris to loach, Misgurnus anguillicaudatus (Blecker, Günther), was studied with variation conditions and the presence of other bacteria in the water medium. Invasion of fish by the poathogen varied with different water conditions. The highest prevalence of infection was observed in an experimentally formulated water containing 0·03% NaCl 0·01% KCl, 0·002% CaCl 2 2H 2 O and 0·004% MgCI 2 6H 2 O. The percentage of infection in tap water was similar to that of the formulated water. The infeetion rate was low in the individual salt solutions, and no infection occurred in distilled water. Even in the formulated water, the pathogen failed to infect the fish when Citrobacter freundii, Aeromonas hydrophila or Pseudomonas fluorescens were present at densities 100 times that of F. columnaris. However, in such cases, the numbers of F. columnaris in the mucus of the fish body surface did not increase much throughout the experimental period. In contrast, F. columnaris suceessfully invaded the fish in the presence of either Streptococcus sp., Flavobacterium flavescens or Flavobacterium fuscum , even when the numbers of these bacteria were 1000 times that of F. columnaris. In this ease, F. columnaris gradually increased its numbers on the fish body surface.