9384

• UCREFRP Catalog Number: 9384
• Author: Valdez, R. A. and R. J. Ryel.
• Title: Summary of Recovery Goals for the Four Endangered Fishes of the Colorado River Basin.
• USFW Year: 2000.
• USFW - Doc Type: Logan.
• Copyright Material: NO

Colorado Pikeminnow - 2

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B. Objective, Measurable Recovery Criteria

Downlisting Criteria
Downlisting of Colorado pikeminnow from endangered to threatened will be considered
when the Green River and Upper Colorado River subbasins meet genetic criteria of at least 2,200
adults combined for 5 years, and downlisting criteria listed below are met.

All Populations
1. Populations in the Green River, Upper Colorado River, and San Juan River
subbasins are maintained such that:
a. the estimated populations are not significantly less than the point estimates
of the first reliable estimate available for each population for 5 years,
b. a trend in population point estimates for the same 5-year period that does
not decline significantly, and
c. a proportion of age 3 fish for each year that is not significantly higher than
30% or lower than 20% of the adult population for the same 5-year period
(Table 2).

Green River Subbasin
1. A minimum estimated population of 2,550 adults for a period of 5 years, such
that:
a. the lower 95% confidence interval of the estimated population of adults
exceeds 2,550,
b. a trend in adult population point estimates for the same 5 year period that
does not decline significantly, and
c. a portion of ages 0, 5, and 6 that equal or exceed catch rates and
proportions provided in Table 3 for 3 ofthe same 5 years.
2. Provide flows necessary to recover the Colorado pikeminnow, including
tributaries necessary to life history; i.e., Yampa, White, Duchesne, and Price
flvers.
3. Implement activities to successfully expand the range of the population of the
Green River subbasin and enhance recruitment; i.e., maintain unimpeded fish
passage within occupied habitats; minimize entrainment in the Green River Canal.
4. Implement nonnative fish control, as needed, to recover the Colorado
pikeminnow.

Upper Colorado River Subbasin
1. A minimum estimated population of 600 adults for a period of 5 years, such that:
a. the lower 95% confidence interval of the estimated population of adults
exceeds 600,
b. a trend in adult population point estimates for the same 5 year period that
does not decline significantly, and
c. a portion of ages 0, 5, and 6 that equal or exceed catch rates and
proportions provided in Table 3 for 3 of the same 5 years.