S: (n) white fungus, Saprolegnia ferax (a fungus that attacks living fish and tadpoles and spawn causing white fungus disease: a coating of white hyphae on especially peripheral parts (as fins))
S: (n) fungus (an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia)
S: (n) water mold (parasitic or saprobic organisms living chiefly in fresh water or moist soil)