Potamodromy and Reproduction of Colorado Squawfish in the Green River Basin, Colorado and Utah
- 1 November 1990
- journal article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 119 (6) , 1035-1047
- https://doi.org/10.1577/1548-8659(1990)119<1035:parocs>2.3.co;2
Abstract
Movements of Colorado squawfish Ptychocheilus lucius were studied by radio-tracking and recapturing tagged fish in the Green River basin of Colorado and Utah, 1980–1988. Of 153 fish tracked, 63% were highly mobile: 41% migrated to known spawning sites, 11% migrated to suspected spawning sites, and 11 % moved to other locations. Nonmigratory behavior of tracked fish (18%) was linked with non-annual spawning or sexual immaturity. Contact was lost with 14% of the fish, but five that were lost one year migrated in subsequent years. Some fish (5%) were radio-tagged after the spawning season. Spawning migrations began about 28 d after highest spring flows when water temperatures were 9°C or greater. Movement offish to spawning areas (N = 63) averaged 140.7 km (range, 32–372.8 km) in downstream (73%) and upstream (23.8%) directions, and some fish (3.2%) moved downstream in tributaries, then upstream in the mainstream. An autumn-to-spring home range was indicated by radiotelemetry and recaptured fish. Co...Keywords
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