Number of juvenile Delta Smelt analyzed for otolith microstructure in this study, sorted by region and year.

All fish collected at the Yolo Bypass were genetically confirmed as pure Delta Smelt. Cache is Cache Slough region, DWSC is Sacramento Deep Water Ship Channel, LSZ is low salinity zone, SR is Sacramento River, and Yolo is Yolo Bypass. Numbers in parentheses indicate the number of fish that were also processed for diet analysis, followed by the number of fish with stomach content intact.