We examined a Heptagenid species of mayfly Electrogena ujhelyii (Sowa, 1981) in order to get information about its life cycle and production in special conditions of intermittent stream. Information about biology and distribution of this species is scarce and long term life cycle data are missing. We detected five generations of species with univoltine winter life cycle during four years long research and evaluated impact of environmental conditions such as temperature and food quantity on average daily production of species. Nymphal development and daily production depended on water temperature not on the food quantity. Moreover we compared production, biomass and PB ratio of each generation in order to get data about changes under the unfavourable conditions of water loss. Life history characteristics of the species E. ujhelyii as emergence asynchrony, duration of adult stage, development of several cohorts and high temperature toleration were one of the clues allowing survival of hydrological stress.