Juvenile white sturgeon are known to feed on aquatic invertebrates.  Stomach content analysis has been conducted as a component of on-going studies investigating the success of the hatchery-reared fish released into the Columbia River.  Our analysis indicates that Mysis relicta, an introduced freshwater shrimp, appears to be an important food source for juvenile sturgeon. Mysis relicta was introduced to several West Kootenay area waterbodies in the 1940s and 1960s, including Arrow Lakes Reservoir, as an additional food source for salmonid sportfish.  The well-intentioned introduction proved detrimental, as the mysids competed with kokanee (Oncorhynchus nerka) for food resources in these oligotrophic systems. Mysis shrimp from Arrow Lakes pass into the Columbia River near Castlegar, B.C. where they become available as a food resource for juvenile white sturgeon.