TILAPIA FISHERIES IN LAKE MANZALA, EGYPT

TILAPIA FISHERIES IN LAKE MANZALA, EGYPT.
AHMED R. BAYOUMI* AND MAGDY T. KHALIL**
*National Institute of Oceanography and Fisheries.
**Department of Zoology, Faculty of Science, Ain-Shams University
ABSTRACT
Growth rates of four Tilapia species
(Tilapia zil111. Oreoch~1s nilotica. O.
ga111aea and O. aurea) found in lake Manzala
are low in comparison to those of other
Egyptian lakes. GrO~Jth rate is also slower
now than it was during the 1960’s. This
is attributed to overstocking in the high
eutrophic southern and eastern sectors and
to high salinity 1n the northern sector
of the lake.