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Colorado school children raised trout. The state had to kill a lot of the “poor buggers” for testing.

But an innovative solution is helping Trout in the Classroom cut down the number of fish involved in the fatal testing process

Environment

What 3 million little kokanee salmon can tell us about Colorado’s drought

The celebratory release of kokanee salmon from Roaring Judy hatchery ensures that the fish so popular with anglers continue to propagate – even in drought-ravaged waters

Environment

Xcel Energy may fill the hole left by closing its Hayden coal-fired power plant with salt. And fish.

The utility’s plan to generate electricity using molten salt could serve as a template for other towns facing the end of the age of coal.

Environment

Warming rivers in the western U.S. are killing fish, imperiling industry

Officials in Wyoming, Colorado, Montana and California are asking anglers to fish during the coolest parts of the day to minimize the impact on fish stressed from low-oxygen levels in warm water

Environment

Bird count examines what happens when high-country Colorado irrigators use less water

As the state mulls paying irrigators to leave water in the Colorado River instead of flooding fields, Audubon Rockies is using bird counts in the northwest part of the state to gauge the implications of intentionally drying the landscape.

Environment

Biden administration proposes removing Colorado River fish’s endangered status

Hundreds of thousands of razorback suckers once thrived in the Colorado River and its tributaries, which flow across seven states and Mexico

Environment

Aurora and Colorado Springs want more water. The proposed solution — a new reservoir — would have far-reaching impacts.

Two of Colorado's largest cities are working together because they have the same problem: Planners don’t think they have enough water where they are to support the cities’ expected growth.

Environment

Colorado River cutthroat trout restored to Hermosa Creek near Durango

Some estimates show cutthroats are now found in just 14% of their historic natural habitat

Outdoors

Kill fish to save fish: Behind Colorado’s effort to revive the Rio Grande cutthroat trout

The multi-agency project to restore the native species has been years in the making. But the optics still can be shocking.

Environment

Humanity and nature, mother and son, fulfillment and regret — a field guide

In a short story from her debut collection, author Emily Wortman-Wunder melds her love of wildlife and short fiction into a heart-wrenching meditation

Book Excerpts

To understand the future of the Colorado River, look to a frowny, eel-faced fish: the humpback chub

Talks to revise water-use agreements are set to begin later this year as Colorado River flows shrink. The fate of the humpback chub helps explain the challenge.

Environment

The 25 most read Colorado Sun stories of 2019

These are our stories that received the most readership over the past year, from our investigation into Backcountry.com to coverage of Denver International Airport and environmental issues

Collections

Judge vacates part of protection decision on cutthroat trout species found in Colorado, New Mexico

The Rio Grande cutthroat was the first North American trout to be recorded by Spanish explorers centuries ago.

Environment

Changes were made to water flow out of the Glen Canyon Dam. And that led to more bugs in the Colorado River.

The number of adult midges throughout the Grand Canyon rose by 34% on weekends versus weekdays during last year's experiment

Environment

Razorback sucker is the latest rare Colorado River fish to make it back from the brink of extinction

Environment

Colorado fish are catching the brunt of continuing drought, wildfire runoff

Aquatic life has already seen its habitat diminished significantly in the throes of drought

Environment