8123

• UCREFRP Catalog Number: 8123
• Author: Wydoski, R. S.
• Title: Coordinated Hatchery Facility Plan
• USFW Year: 1994.
• USFW - Doc Type: Need for Captive-Reared Endangered Fish and Propagation Facilities.
• Copyright Material: NO

could be provided by using the hatchery building at the Ouray
Endangered Fish Facility.
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Study (C) - This study would involve restoration stocking of three
' reaches of Colorado waters: (Reach 1 is the Colorado River between
Rifle and Palisade CO; Reach 2 is the Colorado River between Palisade
CO and Westwater Canyon; Reach 3 is the Gunnison River between the
confluence with the Colorado River and Delta CO; Table 18). Two-year-
old bonytails will be stocked in this study to determine survival. If
survival is deemed adequate for development of a self-sustaining wild
population in each of the river reaches, no further stocking will be
' done. If survival is not adequate, additional stocking will be made
to evaluate the affect of fish size to survival.
i 4. Restoration Stocking of Bonytail in Utah Waters
Study (D) - The Utah Division of Wildlife Resources proposes to stock
' 100,000 150 mm bonytails into the Utah waters in the upper basin as a
restoration stocking experiment (Table 19). If this restoration
stocking effort is successful, restoration stocking in other reaches
of the river may be made to establish other populations. If the
effort is unsuccessful, other stocking experiments will be conducted
to determine the fish size that results in the best survival.
5. Restoration or Augmentation Stocking of Colorado Squawfish in Colorado
waters
Study (E) - One reach of the Upper Colorado River (Reach 1 between
' Rifle and Palisade CO in Table 20) is presently unoccupied by the
endangered fishes but was in the historic range of these species and
is proposed for restoration stocking. Another reach (Reach 2 of Table
20) with an extremely small and declining population of Squawfish is
the Gunnison River from its confluence with the Colorado River to
Delta CO. The Colorado Division of Wildlife Resources proposes to
stock 1,953 two-year-old squawfish in Reach 1 and 2,070 two-year-old
squawfish in Reach 2 as an experimental field study (Table 20).
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The space requirement to produce captive-reared endangered fish for the
experiments above is 43.25 acres and the minimal water requirement would
be 606 acre-feet.
X. METHODS USED TO DETERMINE NUMBERS OF CAPTIVE-REARED ENDANGERED FISH AND
HATCHERY FACILITY NEEDS
A. Method Used to Determine Number of Fish and Weiqht from One Paired Mating
by Year. Data on propagation of the endangered Colorado River fishes in
different locations was examined to calculate a growth standard and to
estimated growth of a family lot cohort in the upper basin until the fish
reach sexual maturity. Data was examined from Willow Beach National Fish
Hatchery AZ; Dexter National Fish Hatchery NM; fish facilities at Ouray
National Wildlife Refuge UT; Fish Research Hatchery, Bellvue CO; and field
studies involving ponds in the Grand Valley of Colorado. Professional
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