 The drifting forms of "F. lumbricalis" and "Coccotylus truncatus" form a loose-lying algal stratum in Kassari bay, which is the most abundant community in the Baltic Sea.Because of its unique location and relatively high biomass, it has been used for furcellaran production since the mid 1960s and is an example of a sustainable bioresource utilization.The stratum's (average depth 7.5 m) density seems to differ greatly year to year (Table 1), ranging between 100 000 to 200 000 tons by wet weight.