Abstract
Minckley (1991) hypothesized that introduced nonnative fishes, enhanced by river alterations, are primarily responsible for the demise of native fish species in the Colorado River system. Negative interactions with nonnative competitors and predators may impact all life stages of virtually all native fishes of the system. Predation by nonnative fishes on young Colorado squawfish (Ptychocheilus lucius) and razorback sucker (Xyrauchen texanus) is hypothesized as one reason for the decline of these two endangered species endemic to larger rivers of the Colorado River Basin (Kaeding and Osmundson, 1988; Marsh
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