8058

• UCREFRP Catalog Number: 8058
• Author: Wydoski, R. S.
• Title: Annual Propagation Operation Plan 1996.
• USFW Year: 1996.
• USFW - Doc Type: Denver.
• Copyright Material: NO

area of growout ponds has not been determined because stocking
plans have not been developed for suitable habitat in the upper
basin.
VII. Permanent Propagation Facilities in the Upper Basin
The Program will have permanent propagation facilities at four sites
by September, 1996:
1. Craig Municipal Facilities, Craig, Colorado
(Backup Refuge for Green River Subbasin)
2. Horsethief State Wildlife Area, Grand Junction, Colorado
(Primary Refuge for Upper Colorado River Subbasin)
3. Ouray Endangered Fish Facility, south of Vernal, Utah, and
(Primary Refuge for Green River Subbasin)
4. Wahweap State Fish Hatchery, Big Water, Utah
(Backup Refuge for Upper Colorado River Subbasin and
Production)
VIII. Current Propagation Efforts in the Upper Basin
A. Razorback sucker - Middle Green River Stock. Wild adult razorback
suckers (Middle Green River stock) are being maintained at the
Ouray Endangered Fish Facility. Nineteen wild adult razorbacks
from the Middle Green River stock are in captivity at the Ouray
Endangered Fish Facility. Thirty-one additional wild fish are
needed to develop 25 pedigreed family lots of this stock.
Currently, four family lots from paired coatings are being
maintained as broodstock.
Additional wild razorback suckers will be collected from the Middle
Green River and Upper Colorado River for continued broodstock
development during the spring of 1996. Adult fish that are
presently in captivity will be spawned to continue development of
the broodstock until 25 pedigreed family lots are produced
(Williamson and Wydoski 1994).
During 1996, ten wild adult razorback suckers will be collected
from the Middle Green River prior to or after the spawning season.
During 1996, some wild adults that were used to develop pedigreed
family lots will be released into the Middle Green River near the
River Mile where they were collected (if known) of in the river
reach through the Ouray National Wildlife Refuge. If the stress of
capture, transport, and handling inhibits maturation in fish
collected prior to the spawning season, these fish will be held and
spawned in 1997. Razorback suckers will not be disturbed during
the 1996 spawning season on Razorback/Jensen Bar.
A feasibility study of DNA fingerprinting to determine the
relatedness of captive-reared razorback suckers will be completed
shortly (target date of March 31, 1996). If this genetic technique
provides the tool to ensure that family lots are unrelated, adults
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