The present study was conducted to compare growth, feed utilization and
carcass composition (Oreochromis niloficus) monosex, produced through separation
of sexes (male or female) and hormonal sex reversal techniques with (0,20,40,60 and
80 %) female replacements. Glass aquaria belonging to in Animal and Fish
Production Department, Faculty of Agriculture, Alexandria University are use. The
results indicated that: 1) the most rapidly growing fish fry or fingerlings were
methyltestisterone- hormone (MTH) treated, sex reversed Nile tilapia. While normal
male (NM) and normal female (NF) Nile tilapia produced by separation of sexes came
second and third, respectively, however mixed sex tilapia grew at the lowest rate; 2)
the higher values of condition factor and feed utilization parameters were also highest
in sex reversed tilapia, and lowest in mixed sex tilapia; and 3) fat and energy contents
of hormonal sex reversed tilapia carcass were highest, while the differences between
sex reversed tilapia, separation of sexes and mixed sex tilapia groups for carcass
crude protein and dry matter contents were insignificant.