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A <br />Abstract.- We evaluated the movement of one-, three-, six-, and 36-week-old <br />Colorado squawfish Ptvchocheilus lucius, and two-week-old razorback suckers <br />Xyrauchen texanus in response to three water flow rates and two light levels. <br />Fish were placed in the center of a seven-chambered tank and their locations <br />recorded at water flow rates of 0, 27, and 237 cm3s-1. Tank hydraulics <br />represented natural riverine conditions: a meandering mainstream and <br />associated quiet (backwater) areas. Flow rate., time of day and fish age all <br />significantly affected the extent and direction of fish movement in the tank; <br />downstream movement (drift) was associated with darkness and fast flow for all <br />ages and both species of fish. Similar patterns of drift have been observed <br />in these species in Natural systems, and presumably serve to transport young <br />fish to productive nursery areas. Downstream dispersal.i.s an important <br />species attribute of these rare and endangered fishes.