Materials and Methods: This study was continued on total 300 monosex tilapia, (Oreochromis niloticus L.) through 16 weeks under four treatments (T) with triplication of four different feed variety (Quality … Harvest weight of monosex and mixed sex Tilapia was 133.7 g and 101.5 g, respectively and the difference was significant (p<0.05). Food grade tilapia are simply those tilapia that exhibit the fastest rates of growth. This study was designed to determine the effect of complete substitution of fish meal (FM) by three plant protein sources including extruded soybean meal (SBM), extruded full-fat soybean (FFSB) and corn gluten meal (CGM) on growth and feed utilization of Nile tilapia Oreochromis niloticus and tilapia galilae Sarothrodon galilaeus. Monosex tilapia has great demand and value in the local and international market. Tilapia all male culture is used for mono-sex culture because they have a higher growth rate and a larger max size than females. It’s important to remember that a big chunk of that 240 days is spent in the hatchery, not in the grow-out. Monosex tilapia (all male) farming has taken an important role in the fish farming business throughout the world. The present study want to know their efficiency in composition and on the growth of tilapia. Tilapia grown in pond culture can have a problem with excess reproduction. Under good growth conditions, 1-gram fish are cultured in nursery ponds to 1 to 2 ounces (20 to 40 grams) in 5 to 8 weeks and then restocked into grow-out ponds. The growth of monosex Tilapia was significantly higher (p<0.05) compared to mixed sex Tilapia in all monthly growth check. With the purpose of achieving more productivity in growing tilapia, Oreochromis niloticus, at the unit time, it is important to produce monosex culture that constitutes totally of males (Mair and Little, 1991). Male monosex fingerlings were sex reversed by feeding newly hatched larvae on feed laced with 17-α-methyl testosterone hormone (MT) for 28 days. Background and Objective: Many commercial foods are introduced for monosex tilapia culture. Four isonitrogenous of crude protein (ca. Growth performance of mixed sex and male monosex O. niloticus was done in cages at LwandaDisi beach, Lake Victoria, Kenya. The main species cultured is the Nile tilapia (Oreochromis niloticus), which is popular due to its superior growth rates and ability to grow to large sizes over a wide range of environmental parameters. To prevent this problem, farmers can use monosex culture by separating the males from females. growth of Nile tilapia during monosex culture. The results of the present study revealed that the growth performance of mono-sex and mixed sex Materials and Methods Experimental Design first factor was presence or absence of dietary treatment with 17 MT (monosex and mixed-sex tilapia), the second factor was related to culture system (Cistern, Flow-through, pen and pond). Its disease resistance and ability to efficiently utilize very diverse food sources also make it an ideal candidate for culture. . Male monosex Mixed sex Nile tilapia Growth performance ABSTRACT Comparative growth performance of male monosex and mixed sex Nile tilapia (Oreochromis niloticus) was conducted in six earthen ponds each measuring 150 m 2 at the Kenya Marine & Fisheries Research Institute (KM-FRI), Kegati Aquaculture Research Station. This can lead to stunted growth and lower production rates. Male monosex tilapia cultures are preferred to females because of the differential growth in favour of males. 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