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Screening and evaluation of probiotics as a biocontrol agent against pathogenic Vibrios in marine aquaculture
Author(s) -
Ravi A.V.,
Musthafa K.S.,
Jegathammbal G.,
Kathiresan K.,
Pandian S.K.
Publication year - 2007
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1111/j.1472-765x.2007.02180.x
Subject(s) - paenibacillus polymyxa , biology , penaeus monodon , vibrio , microbiology and biotechnology , shrimp , paenibacillus , cereus , bacillus cereus , american foulbrood , vibrio harveyi , probiotic , vibrio alginolyticus , vibrio vulnificus , pathogenic bacteria , 16s ribosomal rna , bacteria , ecology , spore , genetics
Aims: The present work aims at finding potential probionts from marine sources as a biocontrol agent against pathogenic Vibrio species in shrimp larval culture. Methods and Results: A total of 109 bacterial strains were isolated from seawater, sediment and marine fish‐gut samples, and were screened for their antagonistic activity against Vibrio species. Three strains (Q, Q1 and M) isolated from the marine sediment were found antagonistic against Vibrio strains . Based on 16S ribosomal DNA gene sequence analysis, the strain Q was identified as Paenibacillus spp. (EF012164); Q1 as Bacillus cereus (DQ915582); and the M as Paenibacillus polymyxa (DQ915580). Further, the two bacterial species, Paenibacillus spp. and B. cereus were challenged separately at two different concentrations of 10 4 and 10 5 CFU ml −1 for probiotic activity in the postlarvae of Penaeus monodon against pathogenic Vibrio harveyi and Vibrio spp . Conclusions: The present study identified the probiotic activity of Paenibacillus spp., B. cereus and Pa. polymyxa against the pathogenic Vibrios in the postlarvae of P. monodon. Significance and Impact of the Study: In vivo study reveals that the marine bacterial species can be used as probionts against pathogenic Vibrios in shrimp larval culture practices.