Siddiqui, A. Q.2014-02-032014-02-031979Environmental Biology of Fishes August 1979, Volume 4, Issue 3, pp 257-2621573-5133http://ir-library.ku.ac.ke/handle/123456789/8916DOI:10.1007/BF00005482Tilapia zillii breeds all year round in the equatorial Lake Naivasha with slightly high breeding intensity during wet months (March, May and July–August). A sex ratio of 1 : 1.28 was found between males and females. The smallest mature male and female were 9.0 and 11.0 cm respectively. The fecundity ranged from 2990 to 12344 eggs, with a mean of 6606 eggs. Fecundity showed a curvilinear relationship with total length (log F = 1.7034 + 1.6370 log L) and a linear relationship with body weight (F = 2197 + 28.76 W)enSex ratioBreeding intensityFecundityAfricaCichlidaeArticle