9413 - Laserfiche WebLink

Home Browse Search

of fines from coarse substrates, control of encroaching vegetation, entrainment of organic debris into the system and control of non-native fish). Thus, flow recommendations for spring are aimed more at maintaining and enhancing these effects than for optimizing rare fish habitat used during the spring months as was the case for summer and winter. The exception to this is to assu spring are provided. This summer, razorback sucker habitats during this period After this introduc description of life history flow effects on important 1 a summary of current and flow management and spec that certain key habitats used by razorback sucker during because, unlike Colorado squawfish which spawn during spawn in spring; thus, maintaining or enhancing appropriate likely to be critical to reproduction and survival of young. in, the report begins with a review of habitat use and a tributes of the two target species. Next is a section summarizing bitats and on critical life history processes. This is followed by storic hydrology of the subject reaches. Finally, objectives of Rc recommendations for flows are provided. RAZORBACK SUCKER Information from reports by Osmunc on results of year-round 1986-1988 (Appendix T used in greater proportion studies. Other attributes c recently summarized by A here regarding habitat use in the upper Colorado River is i and Kaeding (1989) and Osmundson et al. (1995) and is based fiotelemetry of razorback sucker in the Grand Valley during ;1). Habitats preferred by razorback suckers (those habitats han their availability would predict) were not identified in those the life history of this species as related to its flow needs were Ada (2001) and are reviewed here where appropriate. Adult Habitat Use Winter Other than during localized home ranges. spawning period, individual razorback suckers have very gh data are limited (3-15 observations per month; 1-4 different 7