The feeding ecology of three piscivorous fish species (perch (<i>Perca fluviatilis</i>), pike (<i>Esox lucius</i>) and burbot (<i>Lota lota</i>)), was studied in the subarctic Pasvik watercourse (69 ° N), northern Norway and Russia. All three species primarily occupied the benthic habitats in the watercourse. Perch and burbot exhibited distinct ontogenetic niche shifts in food resource use, perch ...