Ecophysiology of pathogenic Vibrionaceae from cultured Oreochromis mossambicus (TH 111)

Sandhya Rani, I (2001) Ecophysiology of pathogenic Vibrionaceae from cultured Oreochromis mossambicus (TH 111). PhD thesis, PGPM, Central Marine Fisheries Research Institute.

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Abstract

The present study, "Ecophysiology of Pathogenic Vibrionaceae from cultured Oreochromis mossambicus" was conducted in pond water, sediment and cultured tilapia for a period of 10 months from December 1997 to May 1999 at two stations to assess the species wise dis tri bution and pathogenic potential 01 Vibrionaceae and the effect of environmental paramete rs on them in aquacultu re. 10 Vibrio sp. we re isolated from both the culture ponds, V. anguilla rum, V. parahaemolyticus, V. fischeri, V. f/uvialis, V. furnissii, V. harveyi, V. campbellii, V. metschnikovii, V.cincinnatiensis and V. vulnificus. V. anguilla rum was the predominant flora isolated throughout the study period. Maximum isolates of Vibrionaceae were obtained during the pre monsoon season, while the monsoon recorded less numbers. In the case of vibrios, at station I, significant difference (P<0.01) between seasons was observed, whereas at Station II , no significant difference was noted between seasons but there was significant difference between the Vibrio spp. at 5% level. The three motile Aeromonas sp., A. hydrophila, A. c aviae and A. sobria were isolated th roughout the period of study with A. hydrophila being the most predominant form. No significant difference was obtaired in the Aeromonas spp. between seasons and between species. The filled regression analysis betvveen V. campbellii and the 9 environmental parameters was significant (p<0.05) explaining 85.5% of the variability and A. hydrophila was also significant (P<0.05) explaining 82.9% of the variability. Matrices of correlation showed the influence of environmental parameters on the species wise distribution of Vibrionaceae. Vibrionaceae exhibited maximum resistance towards peniciltin and ampicillin and multiple drug resi stance was very evident. Of the 4 strains tested (V.anguillarum, V.fluvialis, A. hydropllila and A. caviae) for their pathogenicity, V. anguilla rum and A. hydrophila exhibited high pathogenic potential.

Item Type:Thesis (PhD)
Supervisor(s):Chandrika, V
Uncontrolled Keywords:Ecophysiology; pathogenic Vibrionaceae; Oreochromis mossambicus
Subjects:Theses
Divisions:CMFRI-Cochin > Marine Biotechnology
ID Code:7153
Deposited By:Dr. V Mohan
Deposited On:28 Jan 2011 15:04
Last Modified:28 Jan 2011 16:55

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