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The Yellowstone River flows through the morning mist in Hayden Valley. It is framed by pines in the foreground and mountains in the background.

Yellowstone InDepth

This video series explores some of Yellowstone's most popular questions and important issues.

Discover more about America's first national park. Experience Yellowstone InDepth.

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Episode 1: Yellowstone's Restless Giant

Episode 2: Troubled Waters

Episode 3: Bears, A Yellowstone Love Story

Episode 4: The Wolf Generation

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Episode 2: Troubled Waters

On the surface, Yellowstone's waters look placid and pristine. But look closer, and things aren't quite what they seem. There's trouble in the waters. Aquatic invaders - including fish, parasites, and snails -- are moving in on native species. Follow three scientists as they search for answers in restoring health to Yellowstone's lakes and rivers. 7 minutes. transcript - glossary

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Bonus Features
Video: What's on Your Line?  
An illustration of the five species of trout that can be found in Yellowstone. Yellowstone’s waters are alive with a variety of native and non-native fish. Fishing can be a great way to experience the park. Fishing regulations vary depending on the species, so fisherman should know how to easily tell Yellowstone’s fish apart. Learn how to identify Yellowstone’s fish so that, if you fish in the park, you’ll know what’s on your line. 5 minutes. transcript - glossary
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Related Web Site Links

Fishing in Yellowstone - Yellowstone National Park Site

Invasive Threats to Yellowstone Fisheries - Yellowstone National Park Site

Yellowstone Fishing Regularions (1.7MB pdf) - Yellowstone National Park Site

Whirling Disease Initiative - Montana State University Site

Stop Aquatic Hitchhikers - A public awareness campaign, and a program of the U.S. Fish and Wildlife Service and the U.S. Coast Guard.

National Invasive Species Information Center - US Department of Agriculture Site

Aquatic Nuisance Species - US Environmental Protection Agency Site, Region 8

Montana University System Water Center - Montana State University Site

Aquatic Nuisance Species Task Force - Unites States Federal Aquatic Nuisance Species Task Force Site

Whirling Disease Information - Whirling Disease Foundation Site

New Zealand Mudsnail Information - Montana State University Site

Aquatic Invasive Species - Wisconsin State Environmental Resource Center Site

National Aquatic Nuisance Species Clearinghouse - New York Sea Grant Site