The authors investigated the occurrence of aquatic zoosporic fungi in the water of three water bodies of varied trophicity. Dead specimens of fairy shrimp Streptocephalus dichotomus (Crustacea), fish feed in aquacultures on the Indian subcontinent, were used as a bait. Thirty-five zoosporic fungus species, including 20 known as parasites or necrotrophs of many fish species were identified. They included Achlya intricata, Achlya prolifera, Achlya orion, Aphanomyces laevis, Dictyuchus monosporus, Leptolegnia caudata, Saprolegnia delica, Saprolegnia ferax, Saprolegnia monoica and Saprolegnia parasitica, all known as a frequent cause of mycotic diseases in economically important fish populations. Dead specimens of Streptocephalus dichotomus should thus be regarded as vectors of aquatic fungi which induce mycosis in fish.
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