6027

• UCREFRP Catalog Number: 6027
• Author: Tyus, H. M., R. L. Jones and L. A. Trinca.
• Title: Green River Rare and Endangered Fish Studies, 1982-85
• USFW Year: 1987.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

Non-migratory Moved less than 32 km after implantation. (No migratory
pattern observed)
Seasonal Tracking Radio contact maintained at least monthly during the study
period (May - Sept.).
Partial Tracking No contact for one month from 7/1 - 9/1, contact Eor less
than one month, or contact not regained after 8/15.
Lost Fewer than three contacts, no movement pattern
established.
As indicated in Table 4, 40 Colorado squawfish were classified as
migratory, 12 as non-migratory, 32 as partially tracked migrants, 25 as
partially tracked non-migrants, and 9 were classified as lost. These data
indicated that 53% of the adult Colorado squawfish tracked all season in the
Green River were highly mobile. Movements of. all Colorado squawfish are
presented in Appendix 2.
Table 4. Colorado squawfish movement patterns from radiotelemetry, 1980-1985.
Mi razor fish Non-migratory fish
Year Total Partial Seasonal Partial Seasonal Lost
Tagged Number tracking tracking [racking tracking
----------------------------------------------------------------------
1980 6a 2 0 3 0 1
1981 25 7 7 6 0 5
1982 15 4 8 2 0 1
1983 29 6 12 7 4 0
1984 22 Sb 10 1 5 1
1985 26 13 3 6 3 1
Total 123 37 40 25 12 9
a a One fish was removed during study; dissected 8/08/80 - immature male.
b Angler captured and killed 08-12-84.
Two major spawning migrations have been identified in the Green River
Basin by tracking radiotagged Colorado squawfish (Figure 3). One migration
was discovered in the Yampa and upper Green River in 1981 (Tyus and McAda
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