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Pennsylvania biologists ‘stunned’ to find invasive western mosquitofish in Glade Run Lake

It is suspected that invasive Western mosquitofish were illegally dumped in Glade Run Lake in Butler County. (Photo courtesy of U.S. Fish and Wildlife Service)

It appears that someone did a stocking of their own at the newly refurbished Glade Run Lake in Butler County, Pa., upsetting the ecosystem with an unwanted invasive.
Pennsylvania Fish & Boat Commission biologists were stunned to discover western mosquitofish – a small but voracious non-native prey species never before documented in Pennsylvania – during an electrofishing demonstration for a Glade Run Conservancy event in early October.

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