Pellonula leonensis occurs in the River Warri throughout the year and is seasonally abundant. They favour areas with a salinity range of 0.08-3.0‰. The length-frequency polygon showed several modes and the growth pattern was allometric. The condition factor increased with the individual size of the fish and was slightly higher in the females. The fecundity estimate ranged between 9567-16 235 eggs. As much as 11.5% of its body weight was utilized in eggs production. Spawning activities occurred in January and February, and June and July. P. leonensis feeds basically on algae and insects.
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