The 2.5-inch-long Pearl Darter was listed by the federal government as a threatened species in 2017.
Along a 400-mile river that runs from Mississippi into Louisiana, there are big hopes for a tiny fish.
Fifty years ago, pollution caused the tiny Pearl Darter, a snub-nosed bottom dweller, to vanish from a waterway stretching from central Mississippi to southeast Louisiana. "This is the biggest win of my career as a biologist," said Matthew Wagner, a biologist at the U.S. Fish and Wildlife Service.Wagner says oil and gas development, agricultural runoff, and dam construction contributed to the demise of the pearl darter in the 1970s. He and other environmentalists say clean-up efforts and regulations like the federal Clean Water Act have helped bring it back.
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