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The freshwater hyphomycete conidial numbers showed a characteristic pattern of fluctuation under the influence of temperature and biomass deposition in the Lahore Branch of the BRB canal. The conidial numbers showed a gradual increase from 2% in June to 39% in October. The clearing of the substratum from the canal in January played a significant role in the decline of conidial concentration from 13% in December to 6% in February. The total number of hyphomycete species showed an increase from 20 in April to 39 in December.