8291

• UCREFRP Catalog Number: 8291
• Author: Chart, T. E. and L. D. Lentsch.
• Title: Flow Effects on Humpback Chub ‎(Gila Cypha)‎ Populations in Westwater Canyon.
• USFW Year: 1997.
• USFW - Doc Type: Aspinal-46,
• Copyright Material: NO

TABLE OF CONTENTS
EXECUTNE SUMMARY .................................................... i
INTRODUC'TION ..........................................................1
STUDY AREA .........................:...................................3
METHODS .......... ....................................................5
Young of the year .....................................................5
Fish Community ....................................................... 7
RESULTS AND DISCUSSION ..............................
...
8
.
.............
Reproduction and Early Life I~story .
...............................:..................... ..... .8
Hatching Dates ................................................. . 9
Growth of Age 0 Chubs .......................................... 11
Chub YOY Cohort Relative Abundance
.......................................................
YOY chub habit
t 12
a
...............................:......... ~ ..........
Above the Can
on 17
17
y
..............................................
WestwaterCanyon .................................. 20
............
Below the Canyon .......................................:...... 21
~Sympatric Species .............................................. 21
Age 1 and Age 2 Gila spp Catch rates: - as index of recruitment
............................................................ 24
Late Juvenile and Adult Monitoring ....................
. 30
...... ......
.. .
Sympatric Species ...........................
.
. 37
....
.
............
PIT Tag
'ing 38
g
...................................................
Speoeis Identification and Sex Ratio
.................................................38
Movement ..............................................39
Growth .................................................40
Population Estimates
CONCLUSIONS
....:............................................42
.... ............... ..................................................43
YOY ..............................................................43
RECRL)'ITMENT .....................................................44
LATE 3~UVENII,ES /ADULTS .......................................... 45
RECOMMENDATIONS ..................................................... 46
.. ' ~ LITERATURE CIT'ED' ...................................................... 47 ,_