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Five species of Saprolegnia have been isolated from the water samples obtained monthly from Shatt Al-Arab estuary from September, 1976 to August, 1977. These are S. ferax, S. anisospora, S. diclina, S. terrestris and S. parasitica. Out of 81 isolates 43 reached sexual maturity while 38 remained sterile. Maximum abundance was found during winter months while minimum in summer months.

This study, carried out in Shatt Al-Arab river near Basrah, Iraq, reports a close negative (inverse) relation between phytoplankton numbers and decomposing fungi belonging to the family Saprolegniaceae (Oomycetes). This relation seems to depend on substrate relationship and antagonism . In addition the role of other physico-chemical factors, pH, temperature and salinity has been discussed .

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