Paper Title
Evaluation Of The Productive Performance Characteristics Of Nile Tilapia, Oreochromis Niloticus Under The Effects Of Interspecific Hybridization And Dna Transformation

Abstract
This study was conducted to compare and evaluate the productive performance characteristics of the base generation (F0) of Nile tilapia, Oreochromis niloticus under the effect of interspecific hybridization or introducing a fragmented purified DNA isolated from blue tilapia, Oreochromis aureus or common carp, Cyprinus carpio into the gonads of O. niloticus parents. The results showed that daily gain of genetically modified O. niloticus treated with carp DNA improved significantly (P≤0.05) compared to purebreds and the hybrid of ♀ O. niloticus X ♂ O. aureus. Also, the same treatment had significant (P≤0.05) superiority for SGR%/ day compared to purebreds and reciprocal hybrids. The highest mean value of protein content in fish was obtained by Nile tilapia received carp DNA, but did not differ significantly from that of purebred of Nile tilapia. In addition, Nile tilapia received carp DNA had significant superiority (P≤0.05) in lipid content, but did not differ significantly from those of Nile tilapia received Blue tilapia DNA and the hybrid of (♀ O. aureus x ♂O. niloticus). The best or highest mean of FCR and PER were achieved by Nile tilapia received carp DNA, but did not differ significantly from those of Nile tilapia received Blue tilapia DNA, (♀ O. aureus X ♂ O. niloticus) and (♀O. niloticus X ♂ O. aureus). The results of RAPD fingerprinting showed highly genetic polymorphic percentage among purebreds, interspecific hybridization and genetically modified fish. The results of the present work suggest that genetically modified O. niloticus with extraordinary growth rate can be produced by transferring a foreign DNA isolated from O. aureus or C. carpio as a feasible and fast methodology compared to interspecific hybridization. So the present investigation recommended the usage of DNA transfer as a satisfactory technique for fish improvement to modify the growth performance and feed utilization. Key words- Productive performance, genetically modified, DNA transfer, interspecific hybridization, Oreochromis niloticus, Oreochromis aureus