This book brings together distributional and life history information on all of Idaho's fishes. The account includes information on 67 species which have reproducing populations within Idaho. Six other species are included which were introduced but have not survived. The 67 still surviving species are classified in 34 genera representing 13 families of fishes. Thirty-nine species are native to Idaho waters and 28 have been introduced, either legally, accidentally or illegally. Descriptions of the various species are included as are maps of their distribution through the state. There is other information on the Idaho history of each species.