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Columbia River WalleyeColumbia River Walleye — A walleye with a partially digested fish in its mouth. USGS scientists…
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Columbia River Walleye
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. Photo by David Ayers, USGS. Original public domain image from Flickr

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Columbia River Walleye
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. Photo by David Ayers, USGS. Original public domain image from Flickr

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