Bacteriological examination of fingerlings of bighead carp (Aristichthys nobilis) and grass carp (Ctenopharyngodon idella) imported into Malaysia
1986
Shamsudin, M.N. (Pertanian Malaysia Univ., Serdang, Selangor (Malaysia). Faculty of Fisheries and Marine Science)
Six genera of bacteria potentially pathogenic to fish were isolated from the organs of Aristichthys nobilis and Ctenopharyngodon idella fingerlings obtained from two fish importers of Malaysia during the five month study. The organs examined were the kidney, liver, intestine and gills. The methods and media used enabled the isolation of aerobic heterotrophic mesophiles in the organs of the fingerlings. A large number of the isolates were gram negative rods, of the genera Aeromonas, Proteus, Citrobacter, Pseudomonas, Flavobacterium and Chromobacterium, found by other workers to be potentially pathogenic to fish. Several isolates of gram positive cocci of the genera Micrococcus and Staphylococcus were also identified and could be also pathogenic to fish. The genus Bacillus, described as nonpathogenic to fish was isolated. In a reinfection trial, Aeromonas, Citrobacter and Pseudomonas were found to be pathogenic when injected intraperitoneally into healthy fingerlings of the grass carp. Aeromonas, Pseudomonas, Enterobacter and Flavobacterium were also isolated from the kidney and liver of locally-bred fingerlings of bighead and grass carp.
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