9550

• UCREFRP Catalog Number: 9550
• Author: Snyder, D. E. and R. T. Muth.
• Title: Catostomid Fish Larvae and Early Juveniles of the Upper Colorado River Basin - Morphological Descriptions, Comparisons, and Computer-interactive Key.
• USFW Year: 2004.
• USFW - Doc Type: Fort Collins, CO.
• Copyright Material: NO

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CONTENTS

FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . .. 111
PREFACE ............................. IV
ACKNOWLEDGMENTS ................ viii
ABSTRACT ............................ I
INTRODUCTION ........................ 2
Importance of Early Life History
Investigations and Identification ........ 2
This Guide and Prior Descriptions . . . . . . . . . 2
Status and Distribution of the Fish. . . . . . . ., 4
A Combined Developmental Interval
Terminology. . . . . . . . . . . . . . . . . . . . . . ., 5
Characteristics Useful in Identification
of Cypriniform Fish Larvae ............ 7
Myomeres . . . . . . . . . . . . . . . . . . . .. 10
Fins and finfolds . . . . . . . . . . . . . . .. 10
Other countable structures ........ 12
Morphology ................... 12
Pigmentation . . . . . . . . . . . . . . . . . .. 14
Osteology . . . . . . . . . . . . . . . . . . . " 15
METHODS ............................ 16
Specimens Examined. . . . . . . . . . . . . . . . .. 16
Specimen Data, Observations, and Illustrations . 17
Computer-Interactive Key .............. 21

Clearing and Staining Procedures for
Skeletal Study of Small Fish . . . . . . . . . . . . 22

RESULTS AND DISCUSSION. . . . . . . . . . . . . 26

Species Accounts ...................... 27

Catostomus ardens ................. 28

Catostomus catostomus .............. 36
Catostomus commersoni ............. 44
Catostomus discobo/us .............. 52
Catostomus /atipinnis ............... 60
Catostomus p/atyrhynchus ............ 68
Xyrauchen texanus .................. 76

Comparative Summary ................. 84

Size relative to state of development .... 84
Meristics and morphometrics .......... 84
Pigmentation ...................... 88
Mouth characters ................... 93
Skeletal features .................... 94

Computer-Interactive Key ............... 98
Installation ........................ 98

Use .............................. 99

LITERATURE CITED. . . . . . . . . . . . . . . . . .. 102

CD-ROM - COMPUTER-INTERACTIVE
KEY .................... Inside back cover

Number

Page

LIST OF TABLES

Page

Selected juvenile and adult meristics for
Catostomus ardens . . . . . . . . . . . . . . . . . . .. 28
2 Size at apparent onset of selected develop-
mental events for Catostomus ardens . . . . . . 28
3 Size at developmental interval and gut phase
transitions for Catostomus ardens ........ 29
4 Summary of morphometrics and myomere
counts ... for Catostomus ardens ......... 29
5 Dimensions of frontoparietal fontanelle for
Catostomus ardens . . . . . . . . . . . . . . . . . . . . 35
6 Selected juvenile and adult meristics for
Catostomus catostomus ................ 36
7 Size at apparent onset of selected develop-
mental events for Catostomus catostomus .. 36
8 Size at developmental interval and gut phase
transitions for Catostomus catostomus . . . . . 37
9 Summary of morphometrics and myomere
counts ... for Catostomus catostomus . . . . .. 37
10 Dimensions of frontoparietal fontanelle for
Catostomus catostomus ................ 43
11 Selected juvenile and adult meristics for
Catostomus commersoni . . . . . . . . . . . . . . . . 44
12 Size at apparent onset of selected develop-
mental events for Catostomus commersoni 44

Number

13 Size at developmental interval and gut phase
transitions for Catostomus commersoni . . . . 45
14 Summary of morphometrics and myomere
counts ... for Catostomus commersoni ..... 45
15 Dimensions of frontoparietal fontanelle for
Catostomus commersoni . . . . . . . . . . . . . . .. 51
16 Selected juvenile and adult meristics for
Catostomus discobo/us . . . . . . . . . . . . . . .. 52
17 Size at apparent onset of selected develop-
mental events for Catostomus discobo/us . . . 52
18 Size at developmental interval and gut
phase transitions for Catostomus discobo/us 53
19 Summary of morphometrics and myomere
counts ... for Catostomus discobo/us ...... 53
20 Dimensions of frontoparietal fontanelle for
Catostomus discobo/us . . . . . . . . . . . . . . . . . 59
21 Selected juvenile and adult meristics for
Catostomus /atipinnis . . . . . . . . . . . . . . . . . . 60
22 Size at apparent onset of selected develop-
mental events for Catostomus /atipinnis . . . . 60
23 Size at developmental interval and gut
phase transitions for Catostomus /atipinnis 61
24 Summary of morphometrics and myomere
counts ... for Catostomus /atipinnis ....... 61

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