Fig. 1. Comparison of eggs from pre- and post-ovulatory female tilapia. (A) Mean egg mass was significantly higher in pre-ovulatory (Pre; filled bar) than in post-ovulatory females (Post; open bar). Data are shown as means ± S.E.M.; ^**P<0.01). (B) Frequency distribution of egg diameters from pre-ovulatory (filled bars) and post-ovulatory (open bars) females. Note the presence of larger eggs undergoing maturation in pre-ovulatory females.