The importance of microalgae in oil polluted environments has received greater attention in recent times and this has led to several researches on potentials of algae. In the present study, samples of water were collected from Mangrove (tidal) and Ogbe creek (non-tidal) in University of Lagos. Different concentrations of crude oil were added to appropriate volume of water samples such that the mixture of the two was 100ml. The optical density of the samples were measured every other day for 14 days using a spectrophotometer at 680nm. Samples were analysed before and after experiment. Light microscopy identification revealed Chroococcus, Amphipleura, Pinnularia, Navicula and Oscillatoria as surviving species. Although there were fluctuations in the growth rate of both samples, the mangrove sample showed greater and faster utilization than Ogbe creek. This study revealed that degradation rate is subject to environmental conditions, amount of oil tolerant phototropic micro-organisms and the availability of nutrients.
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