Fragilaria construens var. venter was the most representative
of pinnate diatoms year round at different localities.
F. spp constitute an annual percentage mean of 12% of the
total diatoms. Fragilaria taxa had a comparable annual mean
development at the main stem of Ismailia Canal (257 · 104
cells cm2) and Suez branch (232 · 104 cells cm2), but higher
than Port Said branch (88 · 104 cells cm2).