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25- <br />(1980), Minckley and Gustafson (1982), Tyus and Harned (1985) provide <br />additional information on the spawning period of razorback sucker: <br />Bonytail chub <br />o No data are available concerning spawn timing of this species. <br />Hybridization. <br />Humpback chub <br />o Departure from historic hydrographs may lead to hybridization of humpback <br />chub and roundtail chub. <br />Valdez and Clemmer (1982) reported historic flow regimes to be a <br />possible reproductive isolation mechanism. They suggested that peak <br />flow depletion may lead to more humpback chub - roundtail chub <br />interaction. Temperature changes associated with water depletion was <br />cited as a possible mechanism involved. <br />Resource Consultants, Inc. (1985) hypothesized that flow changes <br />contribute to hybridization of humpback chub - roundtail chub. <br />Tyus et al. (1982) reported hybrids in Desolation Canyon on the Green <br />River. <br />Valdez et al. (1982) reported possible hybrids from the Colorado River <br />near DeBeque, Colorado. <br />0