ABSTRACT
Some aspect of biology of Tilapia mariae from lower river Ogun, Akomoje water reservoir with emphasis on the length weight relationship and the well being of the species were investigated. Mean standard lengths of the fish sample were ranged from 13.12±0.61cm in male, while female ranged from 19.83±0.76. The species from the water body revealed negative allometry growth pattern. There was variation in condition factor (k) for both sexes. The well being of the females revealed better condition than the males in all months of study. The sex ratios of Tilapia mariae in the Reservoir was 1:3.12 (M:F), with highest abundance of females in September 1:3.17 and October showing the least 1:2.05 (M:F). The study concludes that there are large population of algae in the water body.
Keywords: Tilapia mariae, Ogun river, reservoir, length-weight