An Ancient Fish Is Running Out of Time

Despite government efforts to expand the population, only perhaps 200 or fewer wild-born pallid sturgeons are thought to inhabit one of its last strongholds — the Montana stretches of the Missouri and Yellowstone Rivers. And now, paradoxically, a federal agency, the Army Corps of Engineers, is pursuing a project that threatens this population, perhaps the most genetically robust of the groups still surviving in the Missouri and Mississippi Rivers.

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