In Nile tilapia Oreochromis niloticus that shows multiple spawning throughout
the year, long photoperiods (18L:6D) promoted general spawning performance as shown by total/relative fecundity in female broodstock compared to those exposed to short (6L:18D) and normal (12L:12D) days (Campos-Mendoza et al., 2004; Tharwat, 2007).