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<br />TABLE OF CONTENTS
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<br />Executive Summary.,.....,.",...,...,.....,......,...........,."......,......,....,......".i
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<br />Table of Contents.. . ...." ..... .,., '. .,..,'. ...... .... ........ ,... '..' .......,.. ...,.. ..., ......v
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<br />List of Tables. ,'.....,...............................................,..............,....'... ..vii
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<br />List of Figures..............,........................"...,...... ..,......,'..........','....., xiv
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<br />Seasonal Abundance, Distribution, and Size-Structure of
<br />Fishes in San Juan River Secondary Channels, 1991-1997.....................1
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<br />Introduction....................,........,....,. .....................,.........2
<br />Study Area................,' .....".............,'............,'..........., ,..3
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<br />Fish Assemblages of San Juan River Secondary Channels
<br />During Spring, 1993-1997,....,...."......................................." ........5
<br />Introduclion...................."...........",.. ....... ........,'.. ........... ,6
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<br />Study Area.........,..............,......., ........."......,......,.... ,.. .....6
<br />Methods..,..,.".,...,.,............,......,...........,.....,.......,...." ,...9
<br />Results,.....,.....,.....,.....".....,.,....,...".,......,.....,.....,........1 0
<br />Water Quality..., .............,'..,.............................. ....11
<br />Spring Secondary Channel Fish Assemblages.......,...... .....11
<br />Population Dynamics",...........".......,..................,.... 21
<br />Flannelmouth Sucker.."....,........................., ...21
<br />Bluehead Sucker..."....,.................... '....,.. ,....27
<br />Common Carp.............,......,............"....", ....36
<br />Channel Catfish......".....,....."..............,..." ....42
<br />Within Reach Species BiomassComparisons.........,....,..... 53
<br />Secondary and Primary Channel Comparisons...,....", ........55
<br />Rare Fish Occurrence in Secondary Channels....,............ ,58
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<br />Fish Assemblages of San Juan River Secondary Channels
<br />During Summer, 1991 - 1997,....."..............",................." ...........66
<br />Introduction....................",......,.........." ......"....", ......,. .67
<br />Study Area...".........,.....,...,..........,......."......,........... ....67
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<br />Melhods,....,..................,.......,......",...........",.."....., ,..,69
<br />Results"......"...."....,........,..........,.,....."....."......,. ....",71
<br />Water Quality..."......,...........,.... .....'.....,'..", ......, ..71
<br />Summer Fish Assemblages."......",............,..." ......., .73
<br />Geomorphic Reach 5"......,...."......,......"..." ..78
<br />Geomorphic Reach 4......,..,..,..".....,....,... .......86
<br />Geomorphic Reach 3.".....,.....,.,....".....". ....,..92
<br />Inter-Reach Comparisons....,.", '...........", ....... .97
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