Abstract
Outbreak ofVibrio infection was reported from a shrimp farm near Chennai, south India. Both green and yellowVibrio were isolated from disease outbreak ofPenaeus monodon (Milne Edwards) culture farm and biochemically confirmed asVibrio parahaemolyticus andVibrio cholerae. Randomly selectedV. parahaemolyticus (VP1) andV. cholerae (VC1) were reconfirmed by partial 16S rRNA gene analysis. Both were tested against post larvae and juveniles ofP. monodon by bath challenge test and intramuscular injection respectively. The study revealed that VP1 is more virulent than VC1 isolated from same source againstP. monodon post larvae and juveniles. Phylogenetic tree based on comparison of partial 16S rRNA gene analysis revealed close relationship of VP1 with other shrimp pathogens likeVibrio harveyi andVibrio alginolyticus. There might be some close relationship for disease development among all these strains.
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