Prey consumption rates of piscivorous brown trout <i>Salmo trutta</i> were studied in the Pasvik watercourse, which forms the border between Norway and Russia. Estimates of food consumption in the field were similar to or slightly less than maximum values from a bioenergetic model. The piscivore diet consisted mainly of vendace <i>Coregonus albula</i> with a smaller number of whitefish <i>Coregonus ...