Mark Fox/Summit Daily NewsBiologists, working with Colorado Division of Wildlife, along with volunteers, walk the Snake River near Keystone, Colo. Tuesday, electro-shocking and netting fish while doing studies and testing as a follow-up to recent fish kills on a stretch of the Snake. The electro-shock stuns the fish briefly, bringing them to the top to be netted, then placed in a holding pen before being weighed, measured and released. For details on what the effort revealed, go to aspentimes.com/fishing.