Diatoms were dominated by the centric forms,
Cyclotella spp. and Aulacoseira spp. The two genera constituted
an annual mean percentage of 87% of the total diatoms.
Centric diatoms, as the total epipelic, were much higher in the
main stem of Ismailia Canal (2957 · 104 cells cm2) than in
Suez (1475 · 104 cells cm2) and Port Said (of 215 · 104
cells cm2) branches. C. ocellata was the most abundant diatom
taxon; it had two peaks, an outburst of 17024 · 104
cells cm2 which was detected at station 3 during winter and
a minor peak of 11802 · 104 cells cm2 at station 2 during
spring. Fragilaria construens var.