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FILE - In this June 27, 2012, file photo, a Chinook salmon, second from the bottom, swims in the Columbia River with sockeye salmon at the Bonneville Dam fish-counting window near North Bonneville, Wash. Juvenile salmon and steelhead migrating out of the Columbia River Basin in high flows are facing a potential lethal problem at spillway dams where increased nitrogen in the water can give fish what divers call the bends. (AP Photo/Rick Bowmer, File)

FILE - In this June 27, 2012, file photo, a Chinook salmon, second from the bottom, swims in the Columbia River with sockeye salmon at the Bonneville Dam fish-counting window near North Bonneville, Wash. Juvenile salmon and steelhead migrating out of the Columbia River Basin in high flows are facing a potential lethal problem at spillway dams where increased nitrogen in the water can give fish what divers call the bends. (AP Photo/Rick Bowmer, File)

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