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...

Phil Savoie / Stonefly (Pteronarcys californica) with Yellowstone cut throat trout (Oncorhynchus clarkii bouvieri), about to catch it from the water, Montana, USA, July.

Phil Savoie / Stonefly (Pteronarcys californica) with Yellowstone cut throat trout (Oncorhynchus clarkii bouvieri), about to catch it from the water, Montana, USA, July.

Phil Savoie / Stonefly (Pteronarcys californica) with Yellowstone cut throat trout (Oncorhynchus clarkii bouvieri), about to catch it from the water, Montana, USA, July.

Phil Savoie / Yellowstone cut throat trout (Oncorhynchus clarkii bouvieri) with a Stonefly (Pteronarcys californica) landed on its dorsal side, Montana, USA, July.

Phil Savoie / Stonefly (Pteronarcys californica) with Yellowstone cut throat trout (Oncorhynchus clarkii bouvieri), about to catch it from the water, Montana, USA, July.

Phil Savoie / Yellowstone cut throat trout (Oncorhynchus clarkii bouvieri) catching Stonefly (Pteronarcys californica) Montana, USA, July.