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Humpback chub in the Grand Canyon have flourished under long-running restoration efforts. But now, exotic fish that prey on chub and other native fish have begun to slip through Glen Canyon Dam. It’s an unprecedented problem caused by the drought-stricken low levels of Lake Powell. KNAU’s Melissa Sevigny spoke with National Park Service fisheries biologist Melissa Trammell about her concerns.
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Foresters are aggressively trying to understand the effects of an invasive insect known as oystershell scale that’s expanded at an alarming rate in recent years and is threatening northern Arizona's iconic quaking aspen groves.
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National Park Service officials are offering anglers cash bonuses for catching brown trout in the Colorado River between Glen Canyon Dam and the Paria River.
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Here’s a fish story for you: what if you could get paid to go fishing all day? The National Park Service wants anglers to help get rid of exotic brown…
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The Arizona Game and Fish Department has stopped trout deliveries from a hatchery near Cornville after finding invasive mud snails during a routine…
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The National Park Service has approved a plan to protect native fish and other aquatic species in the Colorado River below the Glen Canyon. According to a…
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The National Park Service says it will apply cut-stump and occasional spot spray treatments of herbicide along Colorado River's banks in the Grand Canyon…
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Scientists have made the first-ever map of how tamarisk beetles have spread into the Grand Canyon from other states. The leaf-eating beetles were…