Michael Quinton / Cutthroat Trout (Oncorhynchus clarki) group in spring, Idaho

Michael Quinton / Cutthroat Trout (Oncorhynchus clarki) group in spring, Henry's Lake, Idaho

Charlie Summers / Greenback cutthroat Trout (Oncorhynchus clarkii stomias) making its way upstream during the spawning season, Neota Wilderness Area, Colorado, USA, July.

Charlie Summers / Greenback cut throat trout (Oncorhynchus clarkii stomias) in their spawning stream in the Neota Wilderness area of Colorado, USA, July. Significant in this is are the Visible Implant Elastomer Tags (...

Charlie Summers / Greenback cutthroat trout (Oncorhynchus clarkii stomias) under branches of a tree root eroded away by the swift current of their annual spawning stream. Neota Wilderness Area, Colorado, USA, July.

Charlie Summers / A group of Greenback Cutthroat Trout (Oncorhynchus clarksii stomias) huddle together under the safety of a bush root as they rest on their way upstream during their annual spawning run in a Neota Wild...

Charlie Summers / Greenback cutthroat trout (Oncorhynchus clarkii stomias) female in digging a redd or nest into which she will deposit her roe. Neota Wilderness, Northern Colorado, USA.

Charlie Summers / Greenback cut throat trout (Oncorhynchus clarkii stomias) Bear Creek, Colorado Wilderness, USA.

Charlie Summers / Greenback cutthroat trout (Oncorhynchus clarkii stomias) male hovering over a redd or nest that the female, in the middle had just dug and hollowed out. Neota Wilderness, in North Park, Colorado, U...

Charlie Summers / Greenback cutthroat trout (Oncorhynchus clarkii stomias) female fanning her tail whilst digging a redd or nest. Neota Wilderness Area, Colorado, USA. June.

Charlie Summers / Greenback Cutthroat Trout (Oncorhynchus clarkii stomias) in spawning stream, North Park, Neota Wilderness area, Colorado, USA, July.

Charlie Summers / Greenback cutthroat trout (Oncorhynchus clarkii stomias) in spawning stream, Neota Wilderness, Colorado, USA. July.