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On the Colorado River, growing concern for trout and chub

FILE - Kayakers paddle past bathtub rings showing how low Lake Powell levels have declined June 7, 2022, in Page, Ariz. As America's large reservoirs on the Colorado River drop to record-low levels, fish are among those suffering the impact. (AP Photo/Brittany Peterson, File) In this photo provided by Terry Gunn, he casts a line at Lees Ferry near Marble Canyon, Ariz., May 24, 2010. 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) FILE - A sign reading "keep out" is displayed just upstream of Glen Canyon Dam at Lake Powell, June 8, 2022, in Page, Ariz. As America's large reservoirs on the Colorado River drop to record-low levels, fish are among those suffering the impact. (AP Photo/Brittany Peterson, File) 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) Floating boat docks sit on dry ground as water levels have declined near the Callville Bay Resort & Marina in the Lake Mead National Recreation Area, Aug. 30, 2022, near Boulder City, Nev. As America's large reservoirs on the Colorado River drop to record-low levels, fish are among those suffering the impact. (AP Photo/John Locher) In this photo provided by Terry Gunn, an angler displays a rainbow trout caught at Lees Ferry near Marble Canyon, Ariz., May 10, 2010. 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) FILE - Bathtub rings show how low Lake Powell levels have declines June 8, 2022, in Page, Ariz. As America's large reservoirs on the Colorado River drop to record-low levels, fish are among those suffering the impact. (AP Photo/Brittany Peterson, File) In this photo provided by Terry Gunn, Lehman Beardsley, left, and Gunn, who guides fishing trips, pose with a rainbow trout at Lees Ferry near Marble Canyon, Ariz., Nov 7, 1987. As Lake Powell reservoir just upstream declines, it sends warmer water with less oxygen into the river below the dam. Should that water reach 73 degrees, Gunn said his family's guide service may start calling off afternoon trips. (Courtesy of Terry Gunn via AP)