Supplement 1. Data for all 118 coho salmon included in the on-board confinement experiment, metadata (i.e., at-release information) on the 50 coho salmon released with transmitters, and data for additional fish that were biopsied.

File List physiologyRAMPinjury.csv (MD5: 42ed23a64f5dcbf75bab93c134548252) net_pen_mortality.csv (MD5: 8f5ca3516853958cfd97c1516bc44777) Description The first data file (“Raby et al purse seine ms online data supplement – physiologyRAMPinjury”) contains all the physiological data from the study, matched up with the fish vitality data. Variable descriptions: Capture = Whether the blood sample is from post-capture or after 24 h of net pen confinement. Spaghetti = The number of the spaghetti tag inserted into the fish, for those included in the net pen study. Cortisol = The plasma concentration of cortisol. Units for this and the other blood variables are provided in the paper. RAMP = RAMP score. Explanation provided in the paper. Orientation = Whether the orientation reflex was impaired (1 = yes). SamplingTime = The time, in seconds, between the fish being brought on board and when it was sampled, with the intervening time spent in a revival tote. FL (cm) = Fork length of the fish. InjuryScore = Injury score explanation provided in the paper. RAMP-Injury score = The combined condition score described in the paper. The second data file (“Raby et al purse seine ms net pen mortality data supplement”) whose data contains information on each of the fish that was included in the net pen confinement experiment. Date = The date the fish was removed from the net pen. OtherTag = Whether a V8-dummy transmitter (V8D) was attached to the spaghetti tag or the 24 h net pen study. Mortality = Whether this fish was counted as a mortality in the estimate and for statistics (i.e., includes moribund fish). Catch = The number of fish caught in the net set in which this fish was caught. SamplingTime = As above. Injury = Injury score, as above. RAMP = RAMP score. RAMPInjury = The combined condition score. FL (cm) = Fork length. Spag# = Spaghetti tag number. Phlebotomy = Whether this fish was blood sampled at capture time (1 = it was). Dummy = Whether a dummy tag was attached to this fish for the experiment. OR = Whether the orientation reflex was impaired at capture time.