Vibrio parahaemolyticus a causative bacterium for tail rot disease in ornamental fish, Amphiprion sebae

T. Marudhupandi,T. T. A. Kumar,Sanjeevi Prakash,J. Balamurugan,N. B. Dhayanithi

Published 2017 in Aquaculture Reports

ABSTRACT

Abstract The present study was performed to identify the tail rot disease causing bacterium in marine ornamental fish, Amphiprion sebae . Bacteria were isolated from the infected immune organs and tail region of A. sebae . Five different bacterial isolates (S1-S5) with different shape, size and colour were chosen for the infection study. The isolated strains were individually challenged with A. sebae at a constant dose of 1 × 10 7 CFU/fish. The virulent strain was found to be S-3, which showed maximum reproducing ability in A. sebae by causing typical tail rot disease and mortality. Furthermore, S-3 strain was identified as Vibrio parahaemolyticus by 16S rRNA gene sequencing (KF738005), biochemical analysis and amplification of tox R gene. Subsequently, extracellular products (ECPs) of V. parahaemolyticus were prepared by cellophane overlay method. The LD 50 value of V. parahaemolyticus and its ECP S were found to be 1 × 10 5 CFU and 5 μg/fish. The histology results revealed that V. parahaemolyticus and its ECP S are the major cause of tail rot disease in A. sebae .

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