The Skeena River contains the major proportion of British Columbia's summer-run steelhead trout. These fish are a highly-prized sports fish which are intercepted in commercial fisheries targeting mainly on sockeye and pink salmon. To manage steelhead more effectively, estimates are required of (1) the capacity of the freshwater habitat to produce smolts, as well as (2) stock productivity, expressed as the number of spawners required to sustain each of the Skeena's many steelhead populations.