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. INTRODUCTION <br />Most salmon and some trout species migrate long distances to <br />spawn in their natal streams. The primary cues to home stream <br />recognition are olfactory, as shown by field and laboratory <br />studies of physiology and behavior (Hasler et al. 1984). <br />Artificial olfactory cues can also attract homing fish if the <br />fish has been imprinted at a sensitive, younger age. This <br />knowledge is now used in the culture of salmon and trout end <br />several imprint-and-return hatcheries are now being operated by <br />state fish and wildlife agencies. <br />Historical records and recent biotelemetry studies indicate <br />that the Colorado squawfish (Ptychocheilus Lucius) also migrates <br />long distances to spawn, and that it may home to certain spawning <br />sites (Archer and Tyus 1984). Little is known about the homing <br />cues of potamodromous fishes such as the squawfish, but olfaction <br />and detection of ground water seepage are two suggested <br />mechansims. Fish that use olfactory senses to home have <br />four traits in common; a high degree of olfactory acuity, a <br />sensitive period for imprinting, an ability to retain imprinted <br />information over a long time period, and ability to return to the <br />imprinting area. A combination of field and laboratory work, and <br />physiological and behavioral studies will be needed to test the <br />olfactory hypothesis for the Colorado squawfish. Such tests will <br />be necessary to justify inclusion of imprint-and-return culture <br />methods in the Colorado squawfish recovery effort. <br />Objectives <br />We propose to: <br />1. Determine the olfactory acuity of the Colorado <br />1