8171

• UCREFRP Catalog Number: 8171
• Author: U.S. Fish and Wildlife Service.
• Title: A Study to Determine the Biological Feasibility of Pit Tags for Endangered Fishes in the Upper Colorado River Basin.
• USFW Year: 1990.
• USFW - Doc Type: Grand Junction, Colorado.
• Copyright Material: NO

1

1
1
1
1
F1
1

1

1
fl
1
1
t
1
3.
4.
5.
needs to be identified before any further 'controlled' studies can be conducted
to evaluate the performance of PIT tags for these fishes. Conducting such
studies in a controlled setting (preferably circular tanks, raceways or ponds
where water levels could be controlled and the ponds drained as needed)
would allow the collection of valuable biological and technical information
concerning the reliability and longevity of the PIT tag. Moreover, the
condition and fate of test fish could be monitored more frequently and
effectively with the likelihood that all study objectives would be accomplished
and meaningful data obtained.
Continue studies on the performance of PIT tags for various sizes of juvenile
Colorado squawfish, razorback sucker, and bonytail to expand on the results
provided herein. Obtaining such data for these fish is pivotal to any future
augmentation program for Colorado squawfish and razorback sucker. These
studies should be conducted in a controlled setting, preferably at a hatchery or
comparable research facility, e.g., Dexter NFH. (Reference Item No. 12 under
'Recommendations').
Continue laboratory studies at Hotchkiss NFH to evaluate the performance of
PIT tags for juvenile Colorado squawfish until July 1990.
Continue monitoring adult Colorado squawfish and razorback sucker PIT
tagged in September 1989 at Dexter NFH. Obtaining information on the
performance of PIT tags for adult fish is important before PIT tags can be
used on wild, adult fish. Additionally, PIT tagging hatchery fish will 1) provide
26
1