As part of a study of trophic connectivity of boreal lakes and their riparian shorelines, juvenile lake troutSalvelinus namaycushwere collected from four small oligotrophic lakes on the Canadian Shield in northwestern Ontario and analyzed for nitrogen and carbon stable isotopes. Nitrogen isotope ratios indicated that these populations of juvenile lake trout were relatively omnivorous, exhibiting individual δ15N values (deviations of the15N/14N ratio from the isotopic standard) consistent with predation on opossum shrimpMysis relicta(41 % of samples), zooplankton (35% of samples), and littoral organisms (25% of samples). Carbon isotope ratios indicated that these juvenile lake trout obtained on average about half of their carbon from littoral sources outside the deepwater pelagic zone. These observations suggest that lake trout in small Canadian Shield lakes depend on some combination of terrestrial inputs and littoral foodwebs to satisfy their energy requirements.