7327

• UCREFRP Catalog Number: 7327
• Author: Johnson, J. E.
• Title: Status of Endangered and Threatened Fish Species in Colorado.
• USFW Year: 1976.
• USFW - Doc Type: T/N 280,
• Copyright Material: NO

River (Rocky Mountain National Park), Grand Co., Colorado.
According to Behnke (1973) the Trapper's Lake cutthroat trout
is "surprisingly close to the approximation of pure S. c.
pleuriticus," even though Yellowstone cutthroat trout were
stocked in the lake from 1943-1950. Other pure populations
are known from Wyoming and Utah. North Beaver Creek,
Sublette Co., Wyoming, and Northwater Creek, Garfield Co.,
Colorado, populations are on NRL.
4. Existing Management Plans
a) Colorado - Discussion of expanding the range in Rocky
Mountain National Park; fish are now limited to one mile
of the Colorado River above Lulu City. Cutthroat trout
in Beaver Creek, Moffat Co., Colorado, a tributary of
the Green River above Dinosaur National Monument were
tested in 1971. Seven of 15 specimens lacked basi-
branchial teeth, indicating rainbow trout hybridization.
The population is expected to continue hybridizing but
should be watched.
b) BIM S.O. in Wyoming has habitat improvement plans for
populations in that state.
5. BLM Interest
a) Inventory - Colorado River highland tributaries (generally
above 8000 feet altitude) flowing through NRL should be
surveyed for native cutthroat trout and/or streams suitable
for their reintroduction. Special attention should be
given to tributaries of Parachute, Roan, Piceance Creek
and Little Snake River in Colorado.
b) Management - Similar to other trouts.
D. Salmo clarki macdonaldi (yellowfin cutthroat trout)
1. Original Distribution (Fig. II) - Twin Lakes, Colorado (Arkansas
River drainage)
2. General Descr Rtion - Coloration silvery with tints of yellow
and yellowish colors on lower fins, spots small, irregular
in shape, not pronounced as in S. c. stomias. (Behnke, 1973 d).
Also see Table 1.
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