This new, updated and greatly expanded edition of a book first published in 1979 describes all the known native and introduced fishes found in freshwater habitats of Washington State, including most of the fishes of Oregon, Idaho and British Columbia. The authors set out the basic methods of fish identification, with keys and illustrations that bring together the traits and forms most useful in distinguishing species and subspecies. Information is presented on a total of 91 fishes found in Washington State.