In the present study, the seasonal variations of density and biomass of the Merismopedia species, which were dominant at certain times in the epipelic algal flora on the littoral sediments of Izmit Bay, were investigated. In addition, some physical and chemical parameters were measured. | A study on the occurrence of Merismopedia Meyen (Cyanobacteria) populations on the littoral sediments of Izmit bay (Turkey)