Pathogenic characteristics like Kanagawa phenomenon,
protease and toxR were used as validating factors of
V. parahaemolyticus. Totally 17 protease and 13 –haemolyic
strains were characterized. In that four strains
were isolated from infected shrimp with 2 -haemolysis
and 3 protease production. Moreover, different Vibrio
extracellular products (ECP) have been identified and
proposed as putative virulence factors that are pathogenic
to shrimp (Harris and Owens, 1999). Ten (10) BG
strains showed positive for both protease and –haemolysis
and considered to be pathogens. However, Sudheesh
and Xu (2001) reported that extracellular products of V.
parahaemolyticus were toxic to Penaeus orientalis and it
was found to be a poor producer of hemolysins. Environmental
strains of V. parahaemolyticus are typically not
human pathogens; therefore, it is important to have data
which states that the occurrence of virulent strains like V.parahaemolyticus and V. cholerae infection through consumption
of cultured shrimp. Due to the marine environmental
conditions, identification of marine vibrios is difficult.
However, BG colonies also produced by V. vulnificus
could not easily identify the causative agent whether V.
parahaemolyticus or V. vulnificus. Moreover, V. vulnificus
is also an important Vibrio spe-cies which can cause
wound infections and septicemia with a high mortality
rate and also associated with disease outbreaks, either
with ingestion of contaminated seafood or infectious
wounds by contaminated sea water (Nascimento et al.,
2001).