Abstract:
A study regarding quantity and distribution of total heterotrophic bacteria isolated from
40 samples of Litopenaeus vannamei purchased in Chon Buri Province, Thailand was
conducted. Results showed that total heterotrophic bacteria ranged from 3.13 x 104 to
1.50 x 107 CFU/g. The most predominant heterotrophic bacteria in this study were
Flavobacterium spp. followed by the less extent numbers of Aeromonas spp., Bacillus spp.,
Vibrio spp., Staphylococcus spp., Pseudomonas spp., Corynebacterium spp., Moraxella spp.,
Enterobacter spp., Proteus spp., Serratia spp., Acinetobacter spp., Alcaligenes spp., Pasteurella
spp., Citrobacter spp., Escherichia spp., Klebsiella spp., Yersinia spp. and Shigella dysenteriae,
respectively. Based on a microbiological standard of total heterotrophic bacteria, most of the
tested shrimp samples in this study did not meet the microbiological quality of USA,
Australia, New Zealand and Japan.