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Razorback sucker <br />Four razorback suckers captured from the 15-mile reach during early June <br />were found either in gravel-pit pond or backwater habitats. Two razorbacks <br />that we radio-tracked spent the remainder of the year in the lower 18-mile <br />reach, in a variety of habitats and depths. Although our limited data on <br />razorback have yet to be extensively analyzed, preliminary comparisons do <br />not reveal appreciable differences between the seasonal habitat-use pattern <br />of this species and that of Colorado squawfish. <br />Plans for 1988 <br />We will continue monitoring movement, microhabitat use and spawning <br />activities of Colorado squawfish and razorback sucker in 1988. Also, a two- <br />way fish trap constructed in the mouth of a gravel-pit pond at RM 174.4 in <br />1987 will be checked daily during spring to help us better understand the <br />use and importance of gravel-pit ponds to rare fishes. All razorback sucker <br />and up to 10 adult Colorado squawfish captured in 1988 will be sent to Dexter <br />National Fish Hatchery (NFH). There they will be used as broodstock for <br />future experimental augmentation programs that we are planning for the <br />Colorado River. A study plan for the augmentation program will be available <br />in summer 1988. Our assessment of winter use of the 15-mile reach by <br />Colorado squawfish is currently in progress. Preparation of the final report <br />will begin in October. <br />29