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lood sera were collected from four Orechromis strains, NA from lake Nser, NK ** from the river Nile Knater area, NH1 {the near offspring of self spawned red tilapia) and NH2(the far offspring of setf spawning of NH1) both the fish ferms around lake Qarun, E-Fayum Government The electrophorctical analysis of their sera showed that the strain NA has the highest relative genetic purity followed NK and NH1, but NH2 is the lowest one.]]>
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