Wending through corn and soybean fields southwest of Chicago, the Illinois River eventually comes to the sleepy little town of Havana, Illinois. On the east bank of the river, the populated side, there is a field station run by the Illinois Natural History Survey. For decades now, inhs biologists in aluminum skiffs have scooted up and down the thinly wooded banks, monitoring local fish- these days, catching, recording and releasing approximately 150,000 of them a year.
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