WSP07697

• File Number: 8240.200.10.B
• Description: UCRBRIP - Riverine Fish Flow Investigations
• Basin: Colorado Mainstem
• Date: 7/1/2001
• Author: CDOW
• Title: Riverine Fish Flow Investigations 2001
• Water Supply Pro - Doc Type: Publication

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seen but not netted. It is anticipated that 2-d modeling will be performed in the 2001-02 fiscal

year for the other four stations in the study. A contract was awarded and should be ready to

start by July 1,2001. Future modeling will follow the procedures developed by Stewart
(2000).

Radio Telemetry
A pilot study was conducted to describe habitat use of roundtail chub, flannelmouth

sucker and bluehead sucker during fan low-flow conditions in the Colorado River at the Com

Lake site. This project was performed under contract with the Larval Fish Laboratory at

Colorado State University. Four roundtail chub, five flannel mouth suckers and five bluehead

suckers ranging from 306 to 562 mm total length were surgically implanted with internal

radio transmitters. Fish were telemetered during day and night so that diel patterns could be

described. This investigation showed that during the fall low-flow period, bluehead sucker,

flannel mouth sucker, and roundtail chub made localized movements and were typically found

near the location of their original capture (Byers et al. 2001).

A follow up telemetry study is to be conducted in the summer of2001, subject to

funding. Data collected from 2000 and 200 I will be analyzed to determine if and how the

habitat categories used in this habitat analysis should be modified to more accurately represent

habitat used by these three native species. Detailed discussion ofthe telemetry work will be

given in the final report.

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