Scientists Fish for Solution to a Mysterious Killer

'Whirling disease' is decimating the stocks of rivers in Montana and adjoining states

The rivers that run through Montana are, for fishing enthusiasts, among the best in the world: gorgeous, majestic, and -- at least, reputedly -- teeming with wild trout.

Every year, some 140,000 anglers line the banks or wade into the waters of the Madison River alone -- 100,000 of them from out of state. Each of them spends hundreds of dollars a day: Fishing contributes more than

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