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vol-15IDENTIFICATION OF OREOCHROMIS NILOTICUS IN EGYPT BY THIN
LAYER POLYACRYLAMIDE ISOELECTRIC FOCUSING.
SAID A. KAMEL
National Institute of oceano9raphy and Fisheries,
Fish Research station, Zama11k, Cairo, Egypt.
/l.BSTRACT
The River Nile is considered the main source of
Oreochrc.is niloticus in Egypt. In the recent years
considerable ecological changes have occurred in the Nile
ecosystem and the northern lakes as well, which may affect
the species population. Therefore, specimens of Oreochrc.is
niloticus were collected from different habitats including
lake Naser, Aswan region, Cairo region, Lake Hariut and lake
Manzallah. Eye lens protein was eKamined and compared by
thin layer isoelectric focusing. It was found that the
protein patterns of the fishes from different localities,
did not eKhibit any significant variation, which may
indicate that O. niloticus in the sites under investigation
still has the proper protein characters of the pure strain
in spite of the ecological conditions.
