Researchers are using radio transmitters to track lake sturgeon in hopes of protecting critical sturgeon habitat, via NPR:

Lake sturgeon are ancient creatures that evolved millions of years ago while dinosaurs still walked the Earth. The species was once common in rivers and lakes from Minnesota to Louisiana, but in the past century, overfishing and habitat destruction have driven it to near-extinction. Missouri scientists are now tracking the river giants in the Mississippi to understand where they reproduce and identify critical habitats to protect.

Before spawning season, the group captured about a dozen adult lake sturgeon in the Mississippi River this spring and carefully implanted radio transmitters under the silvery skin of their bellies, adding to the hundreds of other lake sturgeon that researchers have tagged in previous years.

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