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首页> 美国政府科技报告 >Middle Yampa River Northern Pike and Smallmouth Bass Removal and Evaluation; Colorado Pikeminnow and Roundtail Chub Evaluation: 2004 - 2007
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Middle Yampa River Northern Pike and Smallmouth Bass Removal and Evaluation; Colorado Pikeminnow and Roundtail Chub Evaluation: 2004 - 2007

机译：科罗拉多pikeminnow和Roundtail白鲑评价：2004-2007中扬帕河北派克和小嘴鲈鱼去除和评价;

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摘要

Northern pike (Esox lucius) and smallmouth bass (Micropterus dolomieu) are two of 40 fish species introduced to Colorado and currently found in the Colorado River basin (Nesler 2003). Northern pike were first introduced to the Yampa River basin in Elkhead Reservoir in 1977. This species was introduced to reduce numbers of nonnative suckers in the reservoir (Roehm 2004). Smallmouth bass were also stocked in Elkhead Reservoir in the late 1970s or early 1980s (CDOW 2004). Elkhead Creek flows into and out of Elkhead Reservoir, and has served as a conduit for downstream movement of northern pike and smallmouth bass into the Yampa River. Movement of northern pike into the Yampa River downstream of Elkhead Reservoir was demonstrated as early as 1979 (Tyus and Beard 1990). Prior to 1992, capture of smallmouth bass in the Yampa River was considered an incidental occurrence (Nesler 1995). Large draw-down events of Elkhead Reservoir in 1992 and 1994 may have resulted in the greatest escape of smallmouth bass into the Yampa River (CDOW 2004). Both non-native species have established reproducing, self-sustaining populations in the mainstem, middle Yampa River.

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