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Dominant genera of heterotrophic bacteria were investigated seasonally in Kim River estuarine sediments. Numerical taxonomy on the isolated heterotrophic bacteria were carried out according to their morphological, physiological, nutritional and biochemical characters. Heterotrophic bacteria in the depths of 0 to 10 cm of sampled sediments were almost facultative anaerobes, and 77.9% to 86.9%® of them were Gram negative rods. Dominant genera among the isolates were Pseudomonas, Flavobacterium, Micrococcus, Enterobacteria and Vibrio daring sampling periods. According to their character analyses by similarity index(S), the isolates were clustered in fourteen groups at day type sediments(Site 1) and four groups at sand type sediments(Site 2).
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