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<br />. <br /> <br />STUDY AREA <br /> <br />. <br /> <br />The Utah Division of Wildlife Resources (Division) Vernal office was tasked with <br /> <br /> <br />conducting northern pike removal efforts in critical habitat of the middle Green River. This <br /> <br /> <br />includes the Green River from the Split Mountain boat ramp in Dinosaur National Monument <br /> <br /> <br />(RKM 513; RM 319) to the Sandwash boat ramp (RKM 346; RM 215), which is the staging <br /> <br /> <br />location for rafting trips through Desolation Canyon (Figure 1). This reach and removal <br /> <br /> <br />localities therein were selected based on northern pike observations from previous sampling <br /> <br /> <br />activities. Known concentration areas for northern pike in this reach include the mouths of Brush <br /> <br /> <br />Creek (RKM 490; RM 304.5), Cliff Creek (RKM 487; RM 302.9), Stewart Lake Drain (RKM <br /> <br /> <br />483; RM 300.0), Ashley Creek (RKM 481; RM 299.0) and Sportsman Drain (RKM 477; RM <br /> <br /> <br />296.6) (Figure I). Each of these areas is characterized by slow water and submerged vegetation, <br /> <br /> <br />similar to wetland habitat, which is ideal for northern pike and their spawning activities (Becker <br /> <br />1983; Bry 1996). <br /> <br /> <br />Higher gradients and an abundance of cobble, rubble, and gravel substrates characterize <br /> <br /> <br />the uppermost section of the reach within Dinosaur National Monument. The lower section of <br /> <br /> <br />this reach down to Sandwash boat ramp is a much lower gradient with primarily silt and/or sand <br /> <br /> <br />substrates. Two major tributaries, the Duchesne and the White rivers flow into the Green River <br /> <br />within this section. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />12 <br /> <br />. <br />