changed to a eutrophic freshwater basin due to the
increased amounts of agricultural drainage water and
sewage discharged into it via 7 major drains (Abdel-
Baky et al., 1998). Water, plankton, and mugilid fish
(Liza aurata, n = 160 fish) samples were collected
from 5 different locations of Lake Manzala (Figure)
during 4 seasons, from the winter of 2001 to the
autumn of 2002.