摘要：Ten species of the family Saprolegniaceae were isolated from the fish farm “El Zarco”, State of México,obtained from samples of influent and effluent water of the farm and from infected eggs and individual fish of rainbowtrout. Two species belong to the genus Achlya and 8 to Saprolegnia. Saprolegnia ferax is recorded for the first timefor the State of México. Achlya ambisexualis, A. heterosexualis, S. australis, S. diclinous, S. glomerata, S. parasitica,S. terrestris, S. uliginosa and S. unispora are cited for the first time from Mexico.
