Ryan -
Hybridization between Dolly Varden and bull trout can occur. For example hybridization has been documented in the upper Skagit above Ross Reservoir and upper Peace River also in BC. Likely hybrids have been collected in the headwaters of the South Fork Nooksack and the Queets.

To make life more interesting it has been determined that in much of the range of Dolly Varden and bull trout the two could be separated based on morphological and meristic characteristics. In the Skagit and Snohomish fish that appeared to be Dolly Varden based on those physcial characteristic were determined to be bull trout when tested genetically.

Throughout the range of these char the bull trout are freshwater fish (resident, fluvial, and adfluvial life histories) and Dolly Varden include the anadromous form. However where hybridization has been noted the Dolly Varden were the resident forms and the bull trout migratory (adfluvial or fluvial). Here in Western Washington the only anadromous char are bull trout and so far the only Dolly Varden found have been in headwater areas.

Bottom line there much to learn about these interest fish and no one knows much about the "native char" of western Washington.

Tight lines
Smalma