The aim of this study was to evaluate the effect of crude oil Water Soluble Fraction (wsf) and the aqueous extract of <em>Lepidagathis alopecuroides</em> on fertilty and hatchability of <em>Clarias gariepinus</em>. Artificially fertilized eggs of <em>Clarias gariepinus</em> were exposed to five sublethal concentrations of <em>L. alopecuroides</em> and five concentrations of the water soluble fractions of crude oil. The results showed that there was concentration dependent reduction in hatchability of eggs exposed to <em>L. alopecuroides</em>. A highly significant (p<0.01) but negative linear correlation (r = -0.9327) was observed between percent hatchability and the concentration of crude oil water soluble fraction. Both relationships were linear with regression equations y = -73.68x+65.92 vs. y = -0.085x+75.03 and coefficient of determination (R<sup>2</sup>) = 0.870 vs. 0.915, respectively. This result confirms that both <em>L. alopecuroides</em> and crude oil water soluble fraction are capable of inhibiting hatchability of <em>Clarias gariepinus</em> and reducing the reproductive capacity of this species in the wild.