FILE - In this June 26, 2002, file photo, a three-inch pallid sturgeon swims with hundreds of others in a tank in the Miles City State Fish Hatchery in Miles City, Mont. Wildlife advocates are planning to challenge the approval of a dam on the Yellowstone River critics contend could kill off a dwindling population of a fish that dates to the time of dinosaurs. A bypass channel would be constructed around the dam near the Montana-North Dakota border to let endangered pallid sturgeon reach their upstream spawning grounds. But that's not been done before and the project's been on hold since 2015 under a federal court order. (James Woodcock/Billings Gazette via AP, File)