Fishes are important to ecological connectivity because they move amonghabitat patches through migration corridors (Lucas and Baras 2001). Fishes move because watersheds are characterized by longitudinal, altitudinal, and latitudinal changes in geomorphological and ecological processes, creating functional zones or patches differing in hydrodynamic, thermal, and lighting characteristics, as well as availability of food, shelter, and reproductive habitat. Longitudinal and lateral inputs of water, sediments, and nutrients are also important in creating spatial and temporal variation in habitat (Frissell et al. 1986; Junk et al. 1989; Poole 2002; Fausch et al. 2002). The most obvious movements are longitudinal, such as migration between rivers and lakes or oceans (MacKeown 1984; Northcote 1997); however, lateral movements between the floodplain and main channel are also common among fishes (Junk et al. 1989).