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

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Razorback Sucker - 5

flooded bottomlands.
4. Implement successful activities to expand the range ofthe population of the Upper
Colorado River subbasin and enhance recruitment; i.e., maintain unimpeded fish
passage within occupied habitats; insure passage over Grand Valley Diversion,
Price-Stub Dam, Government Highline Dam, Redlands Diversion; minimize
entrainment in the Grand Valley Canal.
5. Continue nonnative fish control, as needed, to recover the razorback sucker.
6. Take reasonable actions to reduce negative effects of selenium if it is determined
that selenium has significant negative effect on reproductive success and survival
of razorback sucker.

San Juan River Subbasin
1. Maintain through augmentation and/or natural recruitment a wild refugia of at
least 4,500 adults for 5 years after deli sting, unless agreements expand this period
of maintenance.

Gila River Subbasin and Lower Colorado River
1. Two populations, each with a minimum estimated number of 5,800 adults for a
period of 15 years, such that:
a. the lower 95% confidence interval of the estimated population of adults
exceeds 5,800,
b. a trend in adult population point estimates for the same I5-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 IS-year
period.
2. Legal protection and/or assurances for flows and habitats necessary to recover the
razorback sucker.
3. Continue nonnative fish control, as needed, to recover the razorback sucker.