Biological characteristics of Snake River sp/su Chinook salmon.

Mean (SE) size at, and date of, marine entry, growth rate, and size at capture by emigration year for juvenile spring/summer Chinook salmon from the Snake River. The proportion of fish in ocean collections that were marked with adipose fin clip or other tag and the estimated number of spring/summer juvenile Chinook salmon released in the Snake River basin each year are presented. The majority of hatchery production occurs at Dworshak National Fish Hatchery and the McCall, Clearwater, and Rapid River hatcheries. The smolt-to-adult return ratio (SAR) for each emigration year is also included. Hatchery releases for Mid and Upper Columbia River spring Chinook are included for reference (Mid/Upper CR).