The antibacterial activities of five species of Demospongiae collected off the east coast of India were assayed against four dominant marine fouling bacterial strains isolated from the biofilm of fouled aluminium panels. Of the twenty combinations studied there were eleven interactions which accounted fcr similar to 55% of the antibacterial activity. Among.the four bacterial strains investigated, Vibrio sp. was the least sensitive when compared with Pseudomonas sp. The activity scores varied with the different extracts and test organisms used. The results indicated the possible potentialities of these extracts in controlling the microfoulers.
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