The reproductive aspects and the food and feeding habits of Tilapia guineensis were investigated at the Tombia creek in the Nigeria, Niger Delta region. The fecundity of the fish, as well as the gonado-somatic index were examined. It was observed that total length range of fecund female fish was between 12.50 and 17.50cm, while the weight range fell between 35.70 – 113.20g. The weight of eggs ranged from 1.63-5.00g while the number of oocyte ranged between121 – 1,052. The GSI ranged from 2.66 –

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... 11.19. The results indicated that fecundity increases with age or size of fish. The food and feeding habits of the fish showed in all the size range that green algae are the most dominant food organisms in the creek. This was followed by cyanobacteria, detritus and insect larvae, using the numerical abundance method (NAM), and the Frequency of Occurrence Method (FOM). T. guineensis of the Tombia creek, is thus unspecialized feeder or an omnivore feeding on what is readily available in the environment.