Sequence Variances and Phylogenetic Relationship among Seven River Nile Teleostei Species from Qena, Egypt using Partial Mitochondrial Cytochrome-b Gene Sequences

The PCR products from mitochondrial Cytochrome-b gene were sequenced for seven River Nile teleostei species. A three-nucleotides cytochrome-b gene deletion existed in Siluformes catfishs sequences which may accounts for species adaptation and evolution monophyletic need. Analyzed Cytochrome-b gene sequences showed similar nucleotide composition to actinopterygian fishes, also high variation at nucleic level which supported the genes suitability as DNA genetic marker in fish phylogentic studies. Results indicate closer genetic relationship between teleostei/actinoptergian River Nile fish species which reflected shared ancestry. Also, data confirm the close genetic and evolutionary relation of early divergent orders, Acipenseriforms (Sturgeons) and Semionotiformes (Alligator gars). These new sequence data perhaps useful for successful fish managing, conservancy and aquaculture objectives. Additional DNA sequences from other River Nile telesot family representatives utilising the cytochrome-b gene primers used in this study, possibly provide contribution to future fish molecular phylogeny studies in this area.