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Maroc Maroc - WN.COM - Environment - 08/Sep 17:32

Monster catfish and its creepy smile invade PA rivers

Flathead catfish (Pylodictis olivaris) may look like they are perpetually smiling, but these five foot-long fish are no laughing matter in regions where they do not belong. The opportunistic predators are now one of the top predators in Pennsylvania’s Susquehanna River, creating a major threat to the local food web. Without any natural predators to keep them in check, these enormous fish can alter a river system in only a matter of years. For this study, the researchers collected a total of 279 fish and 64 crayfish for stable isotope analysis, including 79 flathead catfish like this one, 45 smallmouth bass, 113 channel catfish and 42 minnows comprising nine species. CREDIT: Penn State. Meet...

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rawstory.com - 16/Sep 15:04

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