One Tough Sucker

The razorback sucker evolved in a wild Colorado River. Now, humans are its biggest problem -- and its only hope.

  • An adult razorback sucker ready for release back into the wild at Lake Mohave after growing several years in captivity.

    Abraham Karam
  • A razorback sucker is released into Lake Mohave after spending more than three years in captivity. Each fish contains a microchip that gives its history.

    Abraham Karam
  • Biologists use underwater lights to attract, then capture, razorback sucker larvae along the shore of Lake Mohave.

    Abraham Karam
  • The larvae are reared in aquariums at Willow Beach National Fish Hatchery. After a few months, the fish are transfered to heated outdoor raceways where they will grow for three years before being returned to Lake Mohave.

    Abraham Karam
  • Lake Mohave, home to one of the largest and most genetically diverse populations of the endangered razorback sucker.

    Abraham Karam
  • Fish biologists check a trammel net during a fish survey at Lake Mohave.

    Abraham Karam
  • A group of non-native common carp wait to be fed by tourists at a boat dock on Lake Mohave. After their introduction in the 1880s, carp quickly established in the lower Colorado.

    Abraham Karam
 

Page 3

In spite of the unabated decline, Marsh perseveres. "I've spent a 30-year career watching the animals I love and work on go down the toilet despite my best efforts," he said. "I love these fish. I want my children, my grandchildren, to have an opportunity to love these fish the way I do. They were a remarkable creation of Mother Nature. For us, as a species, to allow these animals to be extinguished is fundamentally wrong. It's a philosophical thing."

It's an outlook shared by Tom Burke, the fishery group manager for the Lower Basin's multispecies conservation program at the Bureau of Reclamation, who has been a linchpin of razorback recovery efforts here for three decades. A large, bearded man famous for breaking out his harmonica at meetings, Burke has a tendency to wax poetic about the river, and he's smitten by the razorback's tenacity. "They evolved in a river of extremes," he said. "These fish are capable of withstanding 200-plus million metric tons of sediment a year coming out of Grand Canyon. That's --" he paused, trying to think of an apt comparison. "Well, it's a bunch."

Marsh and Burke began working on the Lower Colorado the same year, as field biologists. Their mentors were lifelong collaborators on endangered species conservation, and Marsh and Burke are close friends and colleagues. Their relationship is partly responsible for the continuing push to save Mohave's razorbacks. "We've had the same outlook," said Marsh. "We've had a lot of disagreements over the years, but we agree to disagree. His goal is the same as mine: to do the right thing for these critters."

The Colorado River was always, in Burke's words, "a tough neighborhood" for fish, not only because of its famous sediment load, but also because of its wide fluctuations in water volume, temperature and salt content. The razorback's 50-year-lifespan, he explained, gave it a fighting chance of producing at least one surviving offspring. But then humans made the neighborhood even tougher: We crisscrossed it with dams, and stocked it with voracious fish from far-off lands.

In the 1950s and early 1960s, government officials also routinely poisoned waterways, killing native species in order to stock sport fish like rainbow trout. Using money given to the states from taxes on recreational fishing products, government officials poisoned 2,500 miles of streams and 225,000 acres of lakes in 34 states, according to Anders Halversson, whose new book, An Entirely Synthetic Fish, chronicles America's love affair with rainbow trout.

In 1962, the Wyoming and Utah wildlife agencies orchestrated the ne plus ultra of fish genocide, a massive effort to poison native fish using a chemical called rotenone. The idea was to create a clean slate on the Green River -- a main Colorado tributary originating in Wyoming's Wind River Range -- above the soon-to-be-completed Flaming Gorge Dam, eradicating all life in the water and then filling it with millions of rainbow trout. Using a series of "drip stations" strung along 450 miles of river, as well as airboats and helicopters, officials killed off 450 tons of fish in three days. "As the rotenone front progressed downstream," writes Halversson, "it drove large schools of desperate fish in front of it, a sight that deeply impressed itself on those who saw them ‘thrashing about and struggling for air on the surface of the river.' "

Today, the idea of poisoning rivers and lakes is shocking -- unless it's to kill exotic species to protect native fish populations. But the second part of the Flaming Gorge strategy, stocking game fish, remains standard practice up and down the Colorado. In the Lower Basin alone, more than 100 non-native fish species have either become established in reproducing populations or are continually re-stocked. In the eight years following the Green River poisoning, according to Halversson, fish and game officials filled Flaming Gorge Reservoir with upwards of 20 million rainbow trout. The stocking continues today.

At Willow Beach, a short drive south of the Hoover Dam in Arizona, rainbow trout grow in raceways just yards away from the razorback suckers' pens. Every Friday, year-round, 2,000 rainbows are set free in Lake Mohave.

The rainbows are released away from razorback spawning grounds in an effort to limit predation, and at first it seemed that the rainbows wouldn't be too much of a problem -- as long as young razorbacks had a few safe havens in which to grow. "These fish evolved to spawn as the rivers started to rise from melting snow, and then rising waters would distribute the young into these slow eddy backwater areas," explained Burke. There, he said, the sediment would drop out, the sun would shine, and algae would grow, giving young fish a food source in a protected area.

The scientists established a series of backwater ponds, separated from the lake by man-made berms, designed to mimic the oxbow lakes that formed in the river's original floodplain. The fish grew relatively quickly, but they couldn't grow large enough to fend off predators before the ponds either dried out or reconnected to the lake. So the scientists turned to the hatchery. If wild larvae were collected and reared in safety for as long as possible, the thinking went, the young fish would have a better chance of surviving, and overall genetic diversity would be conserved. (In standard hatchery programs, larvae are produced at the hatchery by selectively breeding certain fish, which severely limits the gene pool.) Still, year after year, most of the fish died shortly after being returned to the lake.

High Country News Classifieds
  • CANYONLANDS FIELD INSTITUTE
    Colorado Plateau Natural & Human History Field Seminars. Lodge, river, hiking options. Small groups, guest experts.
  • NATURE EDUCATION DIRECTOR
    Our mission is to inspire a life-long connection to nature and community through creative exploration of the outdoors. We are seeking an educational leader who...
  • DEVELOPMENT AND MARKETING DIRECTOR
    The Development and Marketing Director is a senior position responsible for the execution of all development and marketing strategies to raise funds and increase public...
  • DEVELOPMENT COORDINATOR
    Coordinates all Wyoming Wildlife Federation philanthropic activities. Tasks include identification, recruitment, and retention of donors, organizing fundraising events, and assisting with grant writing.
  • REALTOR NEEDS A REMOTE ASSISTANT
    This is a business assistant position, The working hours are flexible and you can chose to work from anywhere of your choice, the pay is...
  • CORPORATE & GRANTS PARTNER MANAGER
    Forever Our Rivers Foundation Corporate Partnerships Manager February 2020 www.ForeverOurRivers.org Forever Our Rivers Foundation, a 501(c)(3) nonprofit, was formed in late 2016 with the mission...
  • EXECUTIVE DIRECTOR
    Central Oregon LandWatch is seeking an Executive Director to advance our mission and oversee the development of the organization. Job Description: The Executive Director oversees...
  • WESTERN NATIVE SEED
    Specializing in native seeds and seed mixes for western states.
  • MEDIA DIRECTOR
    Love working with the media? Shine a spotlight on passionate, bold activists fighting for wild lands, endangered species, wild rivers and protecting the climate.
  • STAFF ATTORNEY - NEVADA
    The Center for Biological Diversity is seeking an attorney to expand our litigation portfolio in Nevada. Come join our hard-hitting team as we fight for...
  • EXECUTIVE DIRECTOR
    The Montana Wildlife Federation seeks an energetic leader to advance our mission, sustain our operations, and grow our grassroots power. For a full position description,...
  • HISTORIC COMMERCIAL OPPORTUNITY IN DOWNTOWN NOGALES
    Nogales. 3 active lower spaces and upper floor with lots of potential. 520-245-9000 [email protected]
  • CHUCK BURR'S CULTUREQUAKE.COM BLOG
    Change will happen when we see a new way of living. Thinking to save the world.
  • COMING TO TUCSON?
    Popular vacation house, furnished, 2 bed/1 bath, yard, dog-friendly. Lee at [email protected] or 520-791-9246.
  • DIRECTOR, TEXAS WATER PROGRAMS
    The National Wildlife Federation seeks a Director to lead our water-related policy and program work in Texas, with a primary focus on NWF's signature Texas...
  • SPLIT CREEK RANCH
    Spectacular country home on 48 acres with Wallowa River running through it! 541-398-1148 www.RubyPeakRealty.com
  • OJO CALIENTE COMMERCIAL VENTURE
    Outstanding location near the world famous Ojo Caliente Mineral Spring Resort. Classic adobe Mercantile complete w/living quarters, separate 6 unit B&B, metal building and spacious...
  • NEW MEXICO GILA NATIONAL FOREST HORSE RANCH
    43 acres in the Gila National Forest. Horse facility, custom home. Year-round outdoor living. REDUCED to $999,000, 575-536-3109.
  • EVERLAND MOUNTAIN RETREAT
    Everland Mountain Retreat includes 318 mountaintop acres with a 3,200 square foot lodge and two smaller homes. Endless vistas of the Appalachian mountains, open skies,...
  • COPPER CANYON MEXICO CAMPING & BACKPACKING
    Camping, hiking, backpacking, R2R2R, Tarahumara Easter, Mushroom Festival, www.coppercanyontrails.org.