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From homebodies to prolific swimmers, researchers track Chicago River fish to find out where they are going and why

CHICAGO — Under the muddy surface of the Chicago River, a bluegill swam miles upon miles, back and forth from one end of the river system to another. Next to a quiet, unused barge slip near Bubbly Creek, another bluegill remained safely tucked away during the same two-week span earlier this summer. This kind of fish is not known for being a traveler. So the strikingly different behaviors have .

From homebodies to prolific swimmers, researchers track Chicago River fish to find out where they are going and why

From homebodies to prolific swimmers, researchers track Chicago River fish to find out where they are going and why

Under the muddy surface of the Chicago River, a bluegill swam miles upon miles, back and forth from one end of the river system to another. Next to a quiet, unused barge slip near Bubbly Creek, another bluegill remained safely tucked away during the same two-week span earlier this summer. This kind of fish is not known for being a traveler. So the strikingly different behaviors have intrigued .

Researchers track Chicago River fish to find out where they are going and why

Researchers from the Shedd Aquarium, Purdue University and the Illinois-Indiana Sea Grant are tracking the movements of 80 individual fish in the Chicago River system.