The Babine River ranks as one of the best wild steelhead rivers in the world. It is one of British Columbia's five Class I rivers; streams with this classification offer extremely valuable wilderness fishing opportunities. Despite the world-class status of these fish some features of their biology are not well described. Previous studies include investigation of the age and size of steelhead (Narver, 1969), estimation of population size (Pinsent, 1971) and production characteristics of the Babine River and tributaries (Sebastian, 1988).