Estimated tagged release (autumn and spring) and adult recovery (harvest plus hatchery escapement) of spring Chinook salmon Oncorhynchus tshawytscha from the rearing density study at Warm Springs National Fish Hatchery, Oregon, brood years 2000–2002. Percent recovery is an estimate of total survival, where the expanded recovery is divided by estimated tagged release for each tag code, then multiplied by 100. At autumn release, the density index was approximately 0.06 for the low-density group (4.24 kg/m3), 0.09 for the medium-density group (6.27 kg/m3), and 0.11 for the high density group (8.42 kg/m3). Significant differences (P < 0.05) in release to recovery ratios are denoted by different letters. Significant differences were detected between all brood years, denoted by the letters x, y, and z. Significant difference between densities was detected within brood year 2001, denoted by the letters a and b. Release and recovery data were obtained 7 February 2011 from the coded wire tag Regional Mark Processing Center database (www.rmpc.org).
