7908

• UCREFRP Catalog Number: 7908
• Author: Valdez, R. A. and R. J. Ryel.
• Title: Life History and Ecology of the Humpback Chub ‎(
• USFW Year: 1995.
• Copyright Material: NO

Final Report

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List of Figures . xv

Net upstream and downstream displacement of 188 PIT-tagged humpback chub (225
movements) between consecutive captures separated by ~20 days within the LCR
Inflow aggregation, October 1990-November 1993 ................................. 8-9
Movement of seven PIT-tagged humpback chub between mainstem Colorado River
humpback chub aggregations (A-1 through A-9) ................................... 8-9
Net displacement of 50 Floy- and Carlin-tagged humpback chub originally tagged by
AGF in the LCR 1980-90 and recaptured by BIW in the mainstem, October 1990-

November 1993 ............................................................ 8-10
Capture locations of419 PIT-tagged humpback chub (431 movements) in mainstem
Colorado River (A) and recapture locations in the LCR (B), October 1990-November

1993 ..................................................................... 8-11
Capture locations of 401 PIT-tagged humpback chub (415 movements) in the LCR
(A) and recapture locations in mainstem Colorado River (B), October 1990-November

1993 ...................................................................... 8-12
Fidelity of 60 PIT-tagged humpback chub in the mainstem Colorado River following
presumed spawning in the LCR, October 1990-November 1993 ..................... 8-13
Length-frequency of humpback chub captured in both LCR and Region 1 of
mainstem, October 1990-November 1993 .......................................8-14
Average number of radio contacts per day by remote telemetry station KLCR,
February-August of 1991 and 1992 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-14
Percent of radio-tagged adult humpback chub with active radio transmitters (tags)
located dUring telemetry surveillance in the LCR staging area (RM 61.1-61.5 (A), and
the Little Colorado River (B), during 1991 and 1992 ...............................8-15
Conceptual flow spike in the LCR illustrating timing of movements by 20 radio-tagged
adult humpback chub into the LCR from the mainstem Colorado River. . . . . . . . . . . . . . . . 8-16
Timing of movement for 23 PIT-tagged humpback chub between the mainstem
Colorado River and LCR, October 1990-November 1993 .., . . . . . . . , . . . . . . . . . . . . . . . .8-16
Net displacement by season of radio-tagged and PIT-tagged adult humpback chub
in Region I, October 1990-November 1993 ......................................8-17
Average proportion of fish contacted (APFC) for radio-tagged adult humpback chub
located with telemetry surveillance in Region I under different turbidity levels, season
and time-of-day, November 1990-November 1992 ................................8-18
Average proportion of fish contacts (APFC) at low and high turbidity, during day and
night, for adult humpback chub contacted by remote telemetry station KILR . . . . . . . . . . . . 8-19
Average proportion of fish contacted (APFC) for radio-tagged adult humpback chub
at low and high turbidity, during day and night, for fish contacted by remote telemetry
stations in MGG, February 1993-5eptember 1993 . . . . . . . . . . . . . . . . . . " . . . . . . . . . . . . . 8-19
Fraction of telemetry observation time blocks with horizontal movement of radio-
tagged adult humpback chub in Region I as related to ramping rate and flow,
November 1990-November 1992 .............................................. 8-22
Fraction of telemetry observation time blocks with horizontal movement of radio-
tagged adult humpback chub in Region I during average research and interim flow

cycles .................................................................... 8-22
Stomach pump used to recover gut contents of adult humpback chub ................. 9-2
Drift nets set in tandem to sample near-surface (A) and midwater (B) .................. 9-3
Volumetric composition of invertebrates (excluding Cladoohora) found in stomach
contents of humpback chub from the Little Colorado River aggregation and the
Middle Granite Gorge aggregation during 1992-93 ................................. 9-7
Seasonal volumetric composition of invertebrates (excluding Cladoohora) found in
stomach contents of humpback chub captured between RM 57 and RM 130,
Colorado River, Grand Canyon, 1992-93 .........................................9-7
Volumetric composition of drift collected from Region I and Regions II and III of the
Colorado River, Grand Canyon, 1991-93 ........................................ 9-10
Volume of Cladoohora (A) and total number of invertebrates (B) collected in drift
samples during rising, falling and steady limbs of the hydrograph, by region in the
Colorado River, Grand Canyon, 1991-93 ........................................ 9-10
Volume of Cladoohora (A) and total number of invertebrates (B) collected in drift
samples during rising, falling and steady limbs of the hydrograph, by season, in the
Colorado River, Grand Canyon, 1991-93 ........................................9-12