9572

• UCREFRP Catalog Number: 9572
• Author: Bestgen, K. R.
• Title: Interacting Effects of Physical and Biological Factors on Recruitment of Age-0 Colorado Squawfish.
• USFW Year: 1997.
• USFW - Doc Type: Fort Collins, CO.
• Copyright Material: NO

ENVIRONMENTAL FACTORS AFFECT DAILY INCREMENT DEPOSITION
PATTERNS AND OTOLITH GROWTH IN YOUNG
COLORADO SQUAWFISH (PTYCHOCHE/L USLUC/US~ ........................................................71
Abstract .................................................................................................................. 72
Introduction ............................................................................................................ 73
Methods ..................................................................................................................74
Age validation ................................................................................................. 74
Growth rate effect experiments .......................................................................78
Results .................................................................................................................... 80
Early otolith microstructure ..............................................................................80
Age validation .................................................................................................. 81
Effects of temperature on otolith growth ..........................................................82
Effects of somatic growth rate on otolith growth .............................................82
Discussion .............................................................................................................. 85
Early otolith microstructure and age validation ............................................... 85
Effects of temperature on otolith growth ......................................................... 86
Effects of growth rate on otolith growth .......................................................... 87
Acknowledgments ..................................................................................................92
References ...........................................:.................................................................. 92
INTERACTING EFFECTS OF PHYSICAL AND BIOLOGICAL PROCESSES ON RECRUITMENT OF
COLORADO SQUAWFISH BASED ON OTOLITH ANALYSIS ................................................117
Abstract ................................................................................................................118
Introduction ........................................................................................................ ..120
Colorado squawfish natural history ............................................................. ..121
Study area ........................................................................................................... ..123
Methods .............................................................................................................. ..124
Field collections .............................................................................................124
Laboratory procedures ................................................................................. ..127
Distributions of hatching dates .............................................................. ..127
Diel and cross-channel abundance of larvae .............................................130
Growth rates .......................................................................................... ..131
Individual-based model simulations ...................................................... ..131
Fall recruitment estimates ........................................................................135
Results ................................................................................................................ ..136
Distributions of hatching dates .............................................................. ..136
Diel and cross-channel patterns of abundance of larvae ..........................138
Position, time, and date effects on age and TL of larvae captured........ ..140
Growth rates .......................................................................................... ..141
Individual-based model simulations ...................................................... ..142
Fall recruitment estimates ........................................................................142
Discussion ............................................................................................................143
Distributions of hatching dates .............................................................. ..145
Diel and cross-channel patterns of abundance of larvae .........................147
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