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Scott Brack takes a tissue sample from a small wiper.
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Michael Pearce / The Wichita Eagle
A small, recently eaten shad removed from a wiper helps researchers understand the feeding dynamics of a lake.
Shells from dead zebra mussels line the shoreline in drifts at Cheney.
Blue-green algae stains the surface at Cheney Reservoir. Note the beetle leaving a trail through the algae.
Blue-green algae stains the surface at Cheney Reservoir.
Cheney Reservoir is still several feet low from on-going drought.
Scott Brack sets an 80 foot net for fish at Cheney Reservoir.
Brian Serpan, right, untangles a fish from research nets.
Brian Serpan, left, and Scott Brack bring in a net set at Cheney Reservoir Wednesday morning.
Scott Brack, right, and Brian Serpan.
Biologist are killing a limited number of fish to access their otoliths, which will reveal the fish's age.
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A small wiper had just eaten this tiny gizzard shad, proving biologists a clue to population dynamics.
Bone-like otoliths will tell biologists the exact age of fish, sometimes down to a matter of days.
Gizzard shad, one of the main foods of Kansas predatory fish.
Scott Brack weighs a walleye after it was measured and had it's stomach contents checked wile Brian Serpan records data.
Untangling fish from a gill net.
The otoliths from a large wiper should reveal the fish was four or more years old.
Like a straw in a glass of soda, a plastic tube is used to pull the contents of a fish's stomach for study.
Like a straw taking up soda, biologists use a long plastic tube to remove the stomach contents from predatory fish.
A small white perch, an invasive species biologists are trying to figure out how to best control.
Brian Brack, right, measures a fish while Brian Serpan logs the data for research.
Using a plastic tube to remove the stomach contents from a live fish.
Related story: Study investigates fish feeding habits