Fucoidans are matrix polysaccharides from marine brown algae, consisting of an a-L fucose backbone. In spite of their interest as biologically active compounds, a little convenient source with fucoidanase activity are available for the degradation of the fucalean algae. The authors here report on the isolation of bacterial strain capable of degradation various brown algae fucoidans. Muds from fucoidan manufacture were used as source to isolate bacteria. Fucoidans from Sargassum mcelurei, Sargassum polycystum and Padina of Vietnam sea were used as substrates for testing fucoidanase activity. From thirty isolated marine bacteria, five strains were found to produce intracellular fucoidanases (SW9, SW14, SW21. SW22. SW28). SW21 was found to have the highest fucoianase activity on fucoidan from Sargassum mcelurei F2, Sargassum polycystum F1 and Padina.