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Table 2 Summary of travel rate (rkm/day) data for emigrating yearling Chinook salmon, steelhead, and subyearling Chinook salmon by season

From: Juvenile salmonid migratory behavior at the mouth of the Columbia River and within the plume

Species/stock Season N Travel rate (rkm/day) Mean estimated remaining tag life (days)
Mean SD Minimum Maximum Median  
CH1 Early 330 56.7 47.8 0.7 220.1 47.7 18.9
Late 255 60.1 52.7 0.5 244.9 48.6 19.8
Total 585 58.2 50.0 0.5 244.9 47.7 19.3
STH Early 70 103.7 48.3 1.4 195.6 113.9 18.3
Late 112 88.1 63.8 3.3 252.4 75.8 19.3
Total 182 94.1 58.7 1.4 252.4 94.8 18.9
CH0 Total 811 30.9 31.0 0.6 224.6 21.3 22.1
All species   1,578 48.3 47.4 0.5 252.4 32.4 20.7
  1. Early season detections include 5 to 18 May 2010 and late season detections include 19 May to 7 June 2010 for yearling Chinook salmon and steelhead. Travel rate was calculated from the last detection at the mouth of the Columbia River (rkm 8.3, 4.5, 2.8) to the first detection on the plume array. CH1, yearling Chinook salmon; STH, steelhead; CH0, subyearling Chinook salmon.