Montanans fish for answers to mysterious decline in trout population

Joe Lesar (voice-over):

In June, Montana Fish, Wildlife and Parks announced an effort to find answers about the declines. And in July, fish experts on the Big Hole River did some early electro fishing. A method researchers use to help them study a sample of the population.

When the electrode hits the water, it creates an electrical current that the fish are drawn to. The goal is to find sick fish when they're still alive, and collect samples immediately after they're killed. The quickly preserved samples are sent to specialists to look for signs of disease at the microscopic level.

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