Map of rivers on the north Washington coast on the Olympic Peninsula. 

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... Analysis of Hoh Chinook captured in tribal fisheries to determine population of origin for unclipped and clipped Chinook. Steelhead Baseline and Fishery Collections Fin tissue samples were collected from a total of 892 adult steelhead (unclipped and clipped) in 2008, 2009, and 2010 (Table 1). The unclipped adult winter steelhead were collected from the S.F. Hoh (N = 19), upper mainstem Hoh (N = 46), Calawa (N = 40), Bogachiel (N = 27), and Sol Duc (N = 114), Queets (N = 29), and Salmon Rivers (N = 21; Figure 1). Clipped samples were collected from Cook Creek (Quinault River; N = 150), Bogachiel River (N = 147), Salmon River (Queets River; N = 135) and Sol Duc River Hatcheries (hatchery steelhead are left vent clipped (N = 69). Samples of summer-run Skamania River-origin were collected from the Skamania Hatchery in 2008 and included for comparison. In addition to the baseline collections there were samples taken from recreational and Tribal Indian Gill-Net Fishery (IGN) that included samples of both unclipped and clipped adult winter steelhead (Table 1). The tribal fishery occurred from the mouth of the Hoh River to the Highway 101 Bridge and the recreational fishery occurred from the Hoh River mouth to the confluence with the S.F. Hoh River. Eleven different collections of fishery samples taken from different years and from different locations in the Hoh River were analyzed. These collections were divided into areas above and below Highway 101 and defined as unclipped and clipped. The Highway 101 Bridge is located at River Mile 15.4 and the National Park boundary on the Hoh River is at River Mile 29.6. Coho Baseline and Fishery Collections Anal fin tissue samples were collected from the coho broodstock at the Sol Duc River (summer-run) and Salmon River Hatcheries (early fall-run) in 2010 to use as baseline collections (Table 1). In addition there were 13 unclipped and 21 clipped coho collected during the tribal fishery and eight samples (two unclipped and six clipped) that were collected in the S.F. Hoh River. We also included data for a collection of unclipped fall run coho that were collected in 2003 from the Sol Duc ...