| Abstract:
Twelve aquatic sites in northwest and south of Tehran were sampled at monthly intervals form June through February 1996-1997 for members of Saprolegniaceae. In this study 12 genera and species were isolated.
Saprolegnia with five species and Achlya with two species were more common whereas, Isoachlya, Leptolegniella, Protoachlya and Pythiopsis all had low frequencies. Species of S.ferax was abundant in cool waters of winter and fall, whereas species of S.litolaris had highest frequency during summer months. Species of Achlya chlorata was more abundant during summer months. A.debaryana was isolated during summer and fall with almost the same frequency.
Occurrence of species of this family was comparable with occurrence of those in other temperate zones, although, there was some differences in comparison with findings of other workers.
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