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Degasser | by USFWS Pacific
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Degasser

Nitrogen degassing units are used at the Hagerman National Fish Hatchery to help with the health of fish on Monday, Sept 9, 2013 in Hagerman, Idaho. The hatchery produces 1.4 million steelhead and 170,000 Rainbow Trout each year. Photo: Times-News

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Taken on September 13, 2013