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Potential capability of heterotrophic bacteria to hydrolytic degradation different organic macromolecules in three water layers in the marine channel were determined. In studied channel hydrolysed proteins and lipids. The heterotrophic microflora decomposition chitin were represented by the least abundant group of these organisms. The highest number of bacteria hydrolyzing tested organic macromolecules isolated from surface microlayer. It was demonstrated that no significant differences in number of bacteria decomposition studied organic compounds existed between different parts of harbour. Bacteria isolated from the water studied channel in different seasons hydrolyzing organic macromolecules with different intensity.