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02 Z? CONTENTS Acknowledgements ............. i Genus Rhinichthys-Dace ........ 23 Threadfin Shad Preface ....................... i Key to the Genus Rhinichthys ... 23 Dorosoma petenense .......... 51 Species Accounts .............. i Longnose Dace Family Catostomidae-Suckers .... 52 Frontespiece .................. ii Rhinichthys cataractae ......... 23 Key to the Family Title Page .................... iii Speckled Dace Catostomidae .............. 53 Introduction ................... ' 1 Rhinichthys osculus ........... 24 River Carpsucker Historic Studies of Colorado s Colorado Squawfish Car iodes car io 54 Fish Fauna .................. 1 Ptychocheilus lucius ........... 25 Razorback Sucker Table 1-Fishes Included ....... 1 Genus Gila .................... 27 ............ Xy en texanus 55 River Basins in Colorado ......... 2 Key to the Genus Gila ......... 27 Rio Grande Sucker ucker River Basin Map ............. 3 Roundtail Chub Catostomus plebeius ........... 56 Habitat Types Found in Gila robusta • • • • • • • • • • • • • • • • • 28 Mountain Sucker Colorado Rivers .............. 4 Humpback Chub Gila cypha ...... 29 Catostomus platyrhynchus ...... 57 Alteration in Habitat Caused Bonytail Gila elegans ............ 30 Bluehead Sucker by Man ..................... 6 Rio Grande Chub Gila pandora .... 31 Catostomus discobolus ..... .. 58 Introduction of Fish Species Creek Chub Semotilus .. White Sucker Through Stocking ............ Current Status of Colorado 7 atromaculatus ................ Flathead Chub Hybopsis gracilis ... 31 33 Catostomus commersoni ....... Flannelmouth Sucker 59 Fish Species ................ 8 Suckermouth Minnow Catostomus latipinnis .......... 60 Table 2-Fish Species From Phenacobius mirabilis .......... 34 Longnose Sucker Past Studies ............... 8 Fathead Minnow Catostomus Catostomus .... .. 61 Table 3-Species for use Pimephales promelas .......... 35 .. as Bait Fish ............... 8 Genus Hybognathus ............ 36 Family Cyprinodontidae Fish Structure ................. 9 Key to the Genus Hybognathus .. 36 Topminnows ................. 62 Use of Keys ................... 11 Brassy Minnow Key to the Family Key to the Families of Fish Hybognathus hankinsoni ....... 37 Cyprinodontidae ............ 62 in Colorado ............... 11 Plains Minnow Plains Killifish Family Ictaluridae-Catfish ....... 13 Hybognathus placitus .......... 38 Fundulus zebrinus ............. Plains Topminnow 62 Key to the Family Ictaluridae .... 13 Redside Shiner Richardsonius balteatus 39 Fundulus sciadicus ............ 63 Stonecat Noturus (lauus ......... 13 ........ Genus Notropis ................ 40 Fahnily Osmeridae-Smelt ........ 14 Key to the Genus Notrapis ...... 40 LivebFamily Poecil /Mo uitofish The . . . . . . . 64 Rainbow Smelt Osmerus mordax .. 14 Spottail Shiner Mosquitfish Gamb offish Gambusia affinis . . . . 64 Family Gasterosteidae Notropis hudsonius ........ 41 -Sticklebacks 15 Red Shiner Notropis lutrensis ...... 42 Family Cottidae-Sculpin ........ 65 ............... Brook Stickleback Common Shiner Mottled Sculpin Cottus bairdi ..... 66 Culaea inconstans ............ 15 Notropis cornutus ............. Bigmouth Shiner 43 Family Percidae-The Perches .... 67 Family Cyprinidae-Minnows ..... 17 Notrapis dorsalis .............. 44 Key to the Family Percidae ..... 67 Key to the Family Cyprinidae ... 17 Sand Shiner Notropis stramineus .. 45 Johnny Darter Carp Cyprinus carpio ............ 18 River Shiner Notropis blennius .... 46 Etheostoma nigrum ........... 67 Goldfish Carassius auratus ....... 19 Golden Shiner Notemigonus Iowa Darter Etheostoma exile ..... 69 Stoneroller crysoleucas .................. 47 Orangethroat Darter Campostoma anomalurn ....... 20 Grass Carp Etheostoma spectabile ......... 70 Genus Phoxinus ................ 21 Ctenopharyngodon idella ....... 48 Arkansas Darter . Etheostoma cragini 71 Key to the Genus Phoxinus ..... 21 Tench Tinca tinca ............... 49 ........ ... Northern Redbelly Dace Family Clupeidae-Herrings ...... 50 Glossary of Terms .............. 73 Phoxinus eos ................ 21 Key to the Family Clupeidae .... 50 Literature Cited ................ 74 Southern Redbelly Dace Gizzard Shad Index ........................ 77 Phoxinus erythrogaster ......... 22 Dorosoma cepedianum ......... 50 Map of Rivers in Colorado .. Back Cover iv