asian carp great lakes

Asian carp
KATE.GARDNER / flickr.com

A federal report says genetic markers of Asian carp are still showing up in Chicago-area waterways, which environmentalists say highlights the continuing threat that invasive fish will reach the Great Lakes. 

The U.S. Fish and Wildlife Service has released its findings from 240 water samples it collected during the week of October 20, 2014. Twenty-three of these samples tested positive for DNA from silver carp, one of several Asian carp species that currently infest many Midwestern rivers.