Abstract
The associated microbial community of two infected sponges Hippospongia sp. and Cacospongia sp. were investigated during the summer of 2004 and 2005. The total viable counts associated with Cacospongia sp. exceeds that associated with Hippospongia sp. by 3.6 fold. This bacterial load in the sponge was greater than that of the proximal sea water. Staphylococcus aureus was the predominant species followed by Vibrio parahaemolyticus. It was concluded that sponge samples suffered from large amounts of microbial pathogens, where the infection spread on Cacospongia sp. was greater than that of Hippospongia sp. Moreover, supernatants of seven marine actinomycetes strains were screened for their efficiency to inhibit the growth of the isolated pathogens. The supernatant of Nocardia brasiliensis had the greatest inhibitory effect against Staphylococcus aureus.
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