Twenty four species of cyanobacteria were isolated from a variety of marine habitats collected from Karachi coast and open ocean waters. The species of cyanobacteria were isolated from mix culture using serial dilution techniques at room temperature under constant illumination. The isolated species consist of six unicellular and eighteen filamentous non-heterocystous cyanobacterial species. Heterocystous forms were not obtained during these studies. Isolates were maintained in Marine Biology Culture Collection (MBCC)
