demonstrated that in long-term 50-d exposure experiments, six different cyanobacterial morphotypes, including four filamentous forms (Microcoleus chthonoplastes-like, Phormidium sp.-like, Oscillatoria sp.-like type 1 and Oscillatoria sp.-like type 2) and two coccoid forms (Synechococcus sp.-like and Synechocystis sp.-like),could grow with Casablanca crude oil