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(Jonathunder / Wikimedia Commons)

The remarkable comeback of 13 sport fish species in the Illinois River began just after implementation of the Clean Water Act, according to a new study by the Illinois Natural History Survey. 

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The U.S. Army Corp of Engineers says the best place to stop Asian carp from getting into the Great Lakes is the Brandon Road Lock and Dam in Joliet. But the state says the plan is too expensive for Illinois taxpayers and the shipping industry.

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Along Wolf Lake on Chicago’s Southeast Side lies the only Illinois state park within city limits, where visitors can find fishing spots, biking trails – and invasive species.

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A hefty Bighead carp, one of several types of Asian carp, caught in a net near Morris, Illinois. (Evan Garcia / Chicago Tonight)

A plan to fortify a barrier against Asian carp was set to be released in February but has been stalled by the Trump administration. 

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A silver carp was captured Thursday in the Illinois Waterway below the T.J. O’Brien Lock and Dam, about 9 miles from Lake Michigan. (Courtesy of Illinois Department of Natural Resources)

An 8-pound Asian carp was discovered last week beyond an electric barrier designed to prevent the invasive fish from reaching Lake Michigan. 

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(Forest Preserve District of DuPage County)

A west suburban forest preserve is dispatching an army of freshwater mussels to clean up contaminated waters. “They may be small, but they have enormous beneficial effects on the lives of other organisms,” said one staff member.

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A hefty Bighead carp, one of several types of Asian carp, caught in a net near Morris, Illinois. (Evan Garcia / Chicago Tonight)

Wildlife agencies and fishermen in Illinois are using a Chinese technique to catch Asian carp, an invasive fish species threatening the Great Lakes ecosystem.

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Scientists have found female eggs growing in the testicular tissue of some male largemouth bass taken from the Des Plaines River. (Jonathunder / Wikimedia Commons)

We speak to the co-author of a newly published study in which scientists dissected 51 male largemouth bass and found that 21 – some 41 percent – had grown female eggs in their testicular tissue.