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The purpose of this study was to investigate the antibacterial and anti-fungal activities of four species Sargassum namely: Sargassum polycystum, Sargassum oligocystum, Sargassum crassifolium and Sargassum cristaefolium collected along the coastal areas of Diora-Zinungan Sta. Ana Cagayan, Philippines. Extracts of powdered seaweeds were prepared using sequential extraction with different organic solvents in order to increasing the polarity (Ethanol, n-hexane, dichloromethane and ethyl acetate and aqueous). Five fractions (Ethanol, n-hexane, dichloromethane ethyl acetate and aqueous) were examined for antimicrobial activity by using disc diffusion assay on thirteen (13) strains of aquaculture pathogens. | Antimicrobial properties of Sargassum spp. Phaeophyceae against selected aquaculture pathogens
