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Columbia River Walleye — A walleye with a partially digested fish in its mouth. USGS scientists are studying how non-native fish like this walleye are changing the food web of the Columbia River. For
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U.S. Geological Survey
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Public Domain. Free for editorial, educational, commercial, and/or personal projects. No attribution required.
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animals
water
walleye
perciformes
sander vitreus
percidae
animals eating fish
osteichthyes
yellow pike
yellow pickerel
yellow walleye
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