Numbers of passive integrated transponder (PIT)-tagged smolts used in this study.

Numbers are by species/population and year that were detected/released (Rel) passing Lower Granite Dam; that were subsequently detected/recaptured downstream alive (Live); that were recovered on a bird colony (Dead); or were detected returning as an adult to Bonneville Dam (SAR). NA denotes that complete adult returns were not available. The same fish could be detected multiple times at downstream detection/recapture sites (Live), but only one detection was possible at a recovery site (Dead).