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| RIO GRANDE CUTTHROAT TROUT CONSERVATION |
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OVERVIEW
Cutthroat
trout (Oncorhynchus
clarki) are native to the
Rocky Mountain and coastal areas
of the western US. The Rio
Grande cutthroat trout (O.
c. virginalis) is located
the farthest south of the seven
major and fourteen total
subspecies of cutthroat trout
and was historically the only
trout found in the Rio Grande
drainage of southern Colorado
and New Mexico, as well as the
upper Pecos and Canadian River
drainages in New Mexico. These
yellowish-gray fish have
irregular dark spots
concentrated near their tail and
are readily recognized by their
characteristic red throat
slashes. During spring spawning,
cutthroats may turn a bright
reddish-orange. Rio Grande
cutthroat trout occupy a variety
of habitats across their range.
Historically they could be found
in most cold water environments
from large rivers and alpine
lakes to small streams and
beaver dams. Unfortunately,
their current distribution has
been much reduced. Throughout
much of the 20th century,
public fish managers and private landowners
stocked other, non-native species of trout
(brook, brown, and rainbow) across
the range of cutthroats in order to diversify
trout populations and provide angling
opportunity. Unfortunately these non-natives
have out-competed and hybridized with native Rio
Grande cutthroat trout in many cases. These
interactions, coupled with habitat losses due to
land management practices, development, and
resource extraction, have resulted in the loss
of Rio Grande cutthroat trout from approximately
90% of their historic range. In 2008 the US Fish
and Wildlife Service determined that Endangered
Species Act protections were warranted for the
species and added the species to the candidate
list. Colorado and New Mexico, as well as the US
Forest Service, recognize the Rio Grande
cutthroat trout as a species of concern and are
working diligently to reverse the decline and
provide the public expanded opportunity to enjoy
this fish. Activities include implementing
protective regulations, surveying watersheds to
document and preserve native trout populations,
improving habitat, genetic testing, removing
non-native trout in selected areas, and
restoring Rio Grande cutthroat trout populations
across their historic range. Two Turner
properties, the Vermejo Park and Ladder
ranches are located within the historic
range of Rio Grande cutthroat trout. We
believe the species is a key component
of the native communities on these
properties and have made it a priority
to conserve and restore populations of
Rio Grande cutthroat trout. We
have partnered with state and federal
agencies to manage existing populations
and restore populations where they have
been displaced. Significant,
collaborative conservation efforts are
underway at both the Vermejo Park and
Ladder ranches.
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![]() Costilla Creek drainage on
Vermejo Park Ranch
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Upper Costilla Creek Watershed: Vermejo
Park Ranch - A multi-year effort to
remove non-native trouts from and restore Rio
Grande cutthroat trout to the upper Costilla
watershed was initiated in 2002. An initial phase
(I) of 30 stream km (Costilla Crk.) and 4
lakes (Glacier, #1) was chemically renovated in
2002 and again in 2008. Native
cutthroat trout have been restocked and are doing
well. The restoration area will be expanded in
“phases”, using temporary fish movement barriers
to prevent re-invasion of non-natives, until the
entire Costilla basin above Costilla dam has been
treated and restored to native cutthroat trout. Phase
II, including 5 stream km (Santistevan Crk.)
and 4 lakes (Casias) was completed in 2010; Phase
III, including 9 stream km (Casias Crk.) was
treated and restocked in 2011. This is a
grand restoration vision and is one of the largest
water-shed renovation projects ever undertaken,
but if successful the Costilla basin should
provide a home for New Mexico’s native trout well
into the future.
The New Mexico Department of Game and Fish
and Colorado Parks and Wildlife have
been very willing and capable partners on this
effort, which also includes collaboration with
Trout Unlimited and US Forest Service. |
![]() Costille Creek
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| Upper Vermejo River Watershed: Vermejo Park Ranch - The upper Vermejo River watershed, including Little Vermejo, Ricardo, and Leandro creeks, supports a slightly hybridized (with rainbow trout) Rio Grande cutthroat trout population that co-exists with brook trout. The hybridization is currently very slight (1-2%) and is the result of either historic rainbow stocking or escapement from fishing ponds on a neighboring ranch. Two small sections of the watershed support genetically pure Rio Grande cutthroat above fish migration barriers. Efforts are underway to eliminate sources of rainbow trout and remove brook trout and hybrid fish using electrofishing. In 2010-11 over 12,000 brook trout and several hybrids were removed from approximately 40 km of stream. The goal of this mechanical removal effort is to reduce levels of hybridization and competition allowing the native Rio Grande cutthroat trout to persist in the face of non-native competition. There are no immediate plans to use chemicals to remove non-native fish in the Vermejo River drainage, although chemical renovation remains a future conservation option. Although slightly hybridized, this population remains an important component in the overall conservation plan for Rio Grande cutthroat trout in New Mexico. | ![]() Fish migration barrier on Little Vermejo Creek |
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Las Animas Creek: Ladder Ranch -
Las Animas Creek is perhaps the southernmost location
that Rio Grande cutthroat trout ever existed
historically and represents an important conservation
opportunity for the Turner organization. Due to a
forest fire, subsequent restocking with cutthroat
trout of a different subspecies, and invasion by
rainbow trout, the Las Animas Creek population is now
a mongrel trout.
An idea to restore the native fish community to
Las Animas Creek was initially discussed in the late
1990's and initiated in earnest in 2002. The
restoration plan includes chemically removing
non-native longfin dace and hybrid trout from the
watershed and repatriating the native community of Rio
Grande cutthroat trout, chub, and sucker. The project
was delayed in 2004 due to the presence of threatened
Chiricahua leopard frogs and a general opposition
regarding piscicide deployment by the NM Game
Commission. In
2011 the project was given a green light by the
Commission and we, along with our partners, hope to
begin the restoration process in Las Animas Creek in
2013. The
New Mexico Department of Game and Fish and US Forest
Service are collaborative partners on this effort. |
![]() Petroglyph on Las Animas
Creek - Perhaps the first depiction of a Rio Grande
cutthroat trout
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