Asian Fisheries Society

White faeces syndrome caused by Vibrio alginolyticus and Vibrio fluvialis in shrimp, Penaeus monodon (Fabricius 1798) - multimodal strategy to control the syndrome in Sri Lankan grow-out ponds

Abstract:

Additional mortality of 20–30 % and total rejection of harvest have been recorded for shrimp Penaeus monodon (Fabricius 1798) in Sri Lanka due to white faeces syndrome (WFS). Occurrence of WFS in relation to Vibrio count in culture water, isolation, identification and confirmation of the causative Vibrio, antagonism assay of a locally isolated strain of Bacillus subtilis (Ehrenberg 1835) against the pathogens and the possibility of controlling WFS by a multimodal strategy were carried out. White faeces syndrome was first observed at the 7th week of post stocking when mean total Vibrio count (TVC) in culture water was 3.1±0.17 × 103 CFU mL-1; by the 12th week mean percentage occurrence of WFS was 45.0±1.07 %. The major causative pathogen is a strain of V. alginolyticus (Miyamoto et al. 1961) while a strain of Vibrio fluvialis (Lee et al. 1981) also contributes (accession numbers KU 891054 and KX 361118). Bacillus subtilis showed profound inhibitory activity against both Vibrio species. The tested multimodal strategy (proper disinfection of culture water, zero water exchange and the use of a locally isolated strain of B. subtilis as a bioremediator and a probiotic) could successfully control WFS in grow-out ponds of P. monodon in Sri Lanka.

Publication Date : 2017-12-31

Volume : 30

Issue : 4

Page : 245-261

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Date 2017/12/31
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