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On the Colorado River, growing concern for trout and chub

Lower water levels and rising water temperatures threaten fish survival.

In this photo provided by Terry Gunn, an angler casts a line at Lees Ferry near Marble Canyon, Ariz. June 7, 2011. From prized rainbow trout to protected native fish, declining reservoirs are threatening the existence of these creatures, and also increasing the cost of keeping them alive. (Terry Gunn via AP)

In this photo provided by Terry Gunn, an angler casts a line at Lees Ferry near Marble Canyon, Ariz. June 7, 2011. From prized rainbow trout to protected native fish, declining reservoirs are threatening the existence of these creatures, and also increasing the cost of keeping them alive. (Terry Gunn via AP)

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By Brittany Peterson | The Associated Press