Studies on the effect of dietary L-carnitine supplements on reproductive performance for Oreochromis niloticus are scarce. A Seven months feeding trial was undertaken to examine four L-carnitine levels (control, 300, 600 and 900 mg kg 1 diet) on the reproductive performance for Oreochromis niloticus females and their fries during whole hatching season. A 120 females for were randomly distributed into 4 ponds (30 females per pond) represent four treatments and 4 ponds for the fry produced. During of this study, the reproductive traits for females and growth performance for fries were recorded. It was found that the dietary L-carnitine supplementation at all levels (300, 600 and 900 mg^-1kg) significantly (P<0.01) increased all reproductive performance parameters (females weight (FW), total egg weight per female (EW/F), egg weight (g) per gm of body weight (EW/GF), Absolute and relative fecundity (ABS) and (REL), The ratio of number of eggs / one gram of egg (NE/GE), Hatchability percentage (Hat%), Fry number per fish (FN/F) and Fry number per gram of female body weight (FN/GF)), also, increased all growth  performance parameters for fries produced (body weight, daily weight gain and specific growth rate). and improved feed conversion ratio (FCR) and protein efficiency ratio (PER).