Skip to contents
Environment

First efforts to revive populations of Colorado’s state fish seemed fruitless. Then the greenback cutthroat trout surprised everyone — again.

The species -- previously considered extinct -- is thriving in Herman Gulch, off Interstate 70, after initial stocking attempts now appear to be successful

Colorado Parks and Wildlife biologists prepare tiny greenback cutthroat trout to be transported up Herman Gulch on Wednesday, Sept. 26, 2018. (Jesse Paul, The Colorado Sun)
  • Credibility:

HERMAN GULCH — It has been a long road — or river — to recovery for Colorado’s state fish, the greenback cutthroat trout.

First, the species was considered extinct. Then it was rediscovered, reproduced and reintroduced to waterways across the state for decades, only for scientists to learn through genetic testing in 2012 that they actually had planted the wrong fish.  

Then, the greenbacks were found again — for real this time — in a stream on Pikes Peak. Scientists, using more-sophisticated genetic testing, confirmed the population. They believe the fish had been inadvertently preserved by a hotel owner who stocked beaver ponds on his property with the darting creatures in the 1880s.

Colorado Parks and Wildlife biologists first tried to reproduce and reintroduce the greenback cutthroat trout into a stream, not far from Interstate 70 and the Eisenhower-Johnson Tunnel, in the summer of 2016.

When they returned the next summer, the results were grim. Researchers examining the ribbon of stream that winds down Herman Gulch found that none of the thousands of inch-long swimmers that were hauled up a steep trail by volunteers and placed in the waterway had survived.

But as history has shown, there’s never really an end to the story of the ancient, threatened greenback cutthroat trout.

A few months later, in September 2017, there was a good sign.

“Lo and behold, we found some of the fish that we stocked as young-of-year in September 2016,” said Boyd Wright, a native aquatic species biologist for Colorado Parks and Wildlife’s northeast region. “We thought that it was a failed plant. We are seeing those fish, albeit in a very low percentage of what we stocked out.”

The news for greenbacks got better from there.

The creek has been stocked five times since 2016. Last year, CPW put in older fish, some of which were about 5 inches long.

“The real success story, I think, right now is with those fish we stocked last year as 1-year-olds,” Wright said. “We’ve seen on average about 35 percent survival on those. We’re really happy with that level of success. A year later, they’ve lived through a winter, they’ve lived through a runoff cycle. That’s significant.”

A greenback cutthroat trout previously stocked in Herman Gulch swims in the crystal-clear stream on Wednesday, Sept. 26, 2018. Colorado Parks and Wildlife initially thought their effort to reintroduce the species in Herman Gulch wasn’t fruitful. But two years later there are positive signs. (Jesse Paul, The Colorado Sun)

State wildlife officials chose the Herman Gulch stream, near a popular hiking trail, because a barrier where it spills into Clear Creek near I-70 prevents other types of trout — browns, brooks and rainbows — from sullying the genetics of the pure greenback population.

Before stocking the greenbacks, biologists remove other trout species from the creek.

CPW says the retention rate of the greenbacks in Herman Gulch is an encouraging sign for projects that the agency is working on to reintroduce the fish in other watersheds.

“So far, all of the signs are pointing to ‘Yes, this can work,’ ” Wright said. “That’s not saying there probably won’t be other challenges and things we learn along the way, but we’re not going to be learning anything unless we are putting fish into other environments.”

Greenbacks are being stocked in Dry Gulch, near Herman Gulch, and there are two more streams where CPW is building barriers  — at a cost of about $250,000 — to stock the trout and keep other species out.

“Everything we know about this system tells us that it should support a population of native trout,” Wright said of Herman Gulch. “For us, we expect to have reproductively mature fish by 2019 and will best be able to detect if those fish reproduce successfully by 2020. If we see 1-year-old fish in the system in 2020, we know we had good, successful reproduction in 2019. I think 2020 is going to be a big year for this project.”

The hope is then to replicate that success elsewhere.

The nearly 1,000-year-old species are one of several types of fish that state wildlife officials and their federal partners are working to protect in Colorado.

The Colorado River cutthroat trout was rescued this past summer from the path of the 416 fire near Durango. They were earlier thought to be extinct.

Recently, the razorback sucker, an at-risk Colorado River fish, was downgraded from being endangered to threatened.

Species conservation and recovery are an expensive business — although state wildlife officials can’t say exactly how much money has been spent on the work, which involves multiple federal and state agencies. Still, biologists say it’s worth the effort.

Colorado Parks and Wildlife biologists prepare tiny greenback cutthroat trout to be transported up Herman Gulch on Wednesday, Sept. 26, 2018. (Jesse Paul, The Colorado Sun)

“It’s the native species that evolved here and developed here,” said Leslie Ellwood, a fish and wildlife biologist with the Colorado field office of the U.S. Fish and Wildlife Service and who is also part of the team trying to protect the fish. “I just think there’s a value in protecting the native species where they developed and evolved.”

The greenbacks died off near the turn of the 19th century because of a combination of mining, growth and the introduction of nonnative trout species, such as browns and rainbows.

Anglers also feel a special relationship with species native to Colorado.

“Catching these native fish that are wild — that have been here before we were — is something a little extra when you bring that fish in,” said Dan Omasta, a grassroots coordinator for Trout Unlimited. “These fish will hopefully take hold and people will be able to come up from Denver or over the (Great) Divide and fish for them.”

Colorado Parks and Wildlife biologist Boyd Wright, left, speaks to volunteers on Wednesday, Sept. 26, 2018, who volunteered to haul tiny greenback cutthroat trout up Herman Gulch. “These fish existed here for thousands and thousands of years, yet it only took about 100 years of humans really increasing population and impacts to habitat to almost wipe them off the face of the earth,” Wright said. (Jesse Paul, The Colorado Sun)

That passion for the greenbacks and for fishing was on display on a recent weekday morning. Several dozen volunteers from Trout Unlimited gathered with CPW officials waiting for a truck filled with thousands of tiny greenback cutthroats to arrive from Mount Shavano Fish Hatchery near Salida.

Colorado Parks and Wildlife biologists prepare tiny greenback cutthroat trout to be transported up Herman Gulch on Wednesday, Sept. 26, 2018. (Jesse Paul, via YouTube)

They huddled together in the chilly wind since the truck was more than an hour late. But they didn’t care about the delay.

“It’s pretty amazing to see not only the fish take hold, but the people it brings out in support of this,” Omasta said of the different people involved in hauling the trout up to Herman Gulch. “Just this past summer we had families, we had kids from middle school and a high school, walking alongside old fishermen.”

The volunteers fashioned an informal line as they waited for sloshing, 2-foot-tall, clear-plastic bags, each filled with 500 tiny greenbacks. They stuffed the bags into backpacks and headed uphill to free them into Herman Gulch.

As volunteer Brett Piché strolled up to the stream, several 5- or 6-inch greenbacks darted back and forth in the water. Piché  placed his bag of fish in the water and, after a few minutes, carefully released its contents into the crystal-clear stream.

Immediately, a larger greenback swam up and gobbled a few of its smaller brethren and darted away.

A larger greenback cutthroat trout eats some of its smaller brethren in Herman Gulch on Wednesday, Sept. 26, 2018. (Jesse Paul, via YouTube)
Rising Sun

The greenbacks’ history

The greenback cutthroat trout was presumed to be extinct by 1937, but in the late 1950s, biologists discovered what they thought were populations of the species in the South Platte and Arkansas river basins.

State wildlife officials began working to replenish and reintegrate the fish, which are native to northern Colorado, into streams throughout the state.

Then, in 2012, a University of Colorado study revealed that the species the state had been working to revive was not actually a pure greenback cutthroat trout. Instead, a species in Bear Creek, near Colorado Springs, actually matched DNA samples of the fish preserved in museums.

Leslie Ellwood, a fish and wildlife biologist with the Colorado field office of the U.S. Fish and Wildlife Service, says it is believed the fish ended up in Bear Creek — which is outside their native range, which is mainly the South Platte River basin — because of a hotel owner. Newspaper clippings, Ellwood says, revealed that he stocked beaver ponds on his property with fish in the1880s.

Since 2012, Colorado Parks and Wildlife has been working to protect and breed the fish from Bear Creek.

Colorado Parks and Wildlife biologists prepare tiny greenback cutthroat trout to be transported up Herman Gulch on Wednesday, Sept. 26, 2018. (Jesse Paul, The Colorado Sun)

More from The Colorado Sun