How does a commercial fisherman file taxes when:?

He works on a commercial fishing boat out of Dutch Harbor Alaska for a Maine company, the office headquarters is in Seattle, but he has an Oregon residence? He spends several months at the end of the fishing season working on the boat when its docked for repairs in Fishermans Terminal in Seattle,and travels back and forth between Seattle and Porland. Does he pay Oregon state taxes or what? Also needs to file back 3 years