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‘Cleaner’ Illinois River may invite invasive scud; Scientists fear impact on Lake Michigan sport fish

Scientists are keeping a close eye on scud, which are moving up the Illinois River toward Lake Michigan. (Photo courtesy of Jan Hamrsky)

Through the murky waters of the Illinois River, scud have been moving steadily toward Lake Michigan.
Scientists are worried that if the invasive reaches the lake, it could replace vital native species at the bottom of the food chain, with cascading effects on the diets of other aquatic species – all the way up the chain to salmon and other sport fish.

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