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ACKNOWLEDGEMENTS Many people helped in the preparation of this book. Without their aid, comple- tion of the work would have been impossible. To these people I offer my most sincere thanks and appreciation. Charles Bennett, Gerald Bennett, Steve Burge, James Chadwick, Scott Chartier, Larry Finnell, John Goettl, Mike Japhet, Bob Judy, Rick Kahn, Robin Knox, Mike McAllister, Charlie Munger, Dave Ruiter, Jay Sarason, Clee Sealing, Jay Stafford, Roger Trout, Bill Weiler, Bill Wiltzius, Lawrence Zuckerman and others all spent time and effort in locating records, collecting, and in some cases, transporting live fish across large distances. Jim Bennett, Charles Haynes and Dave Miller not only helped locating specimens but reviewed large portions of text. Wilbur Boldt provided needed assistance in obtaining and maintaining funds to produce this book. Gil Dalrymple, Carol Dreitz and Pat Barnett spent many hours typing the manuscript. Special thanks to Marian Herschopf, whose diligent efforts produced many obscure documents and materials essential to production of this text. PREFACE Colorado's Little Fish is a bit of a misnomer. Some species included in this book attain a length of greater than one foot and weigh in excess of three pounds. Specimens of one fish in the book, the Colorado squawfish, have been recorded up to 65 pounds. The title was chosen to differentiate between two groups of fish species-those actively sought by fishermen and those fish that anglers seldom see or don't desire. Perhaps another title could be "Colorado's Little Known Fish." The term "Little Fish" was chosen in lieu of other names commonly used to describe these fish that have a negative connotation such as "trash" fish or "forage" fish. All of the suckers, minnows, darters, topminnows and members of other families infrequently noticed by fishermen are included in this book. Descriptions, characteristics, habitat needs and life history notes for each species are presented. Included are brief descriptions of the different riverine habitats found in Colorado and the historic distribution of fish species in the geographically separated drainage basins. Man's impact on both habitat and historic fish distribution patterns are discussed. The book is designed to be of use to bait dealers, general public, high school students and first year biology students in college. SPECIES ACCOUNTS The species descriptions presented are the result of an enormous amount of work by fishery biologists both from Colorado and from other states. Where possi- ble, information specific to Colorado populations is given. However, in many cases information from Colorado was not available due to the lack of past studies and surveys within the state. In these cases information from other states was utilized. Photographs for all but two of the species are presented. Photographs were taken of adult fish. If available, pictures of adult males in breeding colors are included. These photographs show the characteristics common to older fish. Juvenile fish may look different (and in some cases, photographs are included) and there may be a great deal of variation in color and shape of adult specimens found in the wild. Rather than rely on photographs alone, the reader is encour- aged to use both the taxonomic keys and species descriptions when identifying an unknown specimen. The distribution maps indicate whether or not a species has been collected in a given county. The maps do not indicate specific waters from which specimens were taken, and the maps are not the final word on distribution. Distribution of any species may be wider than shown on the maps. Future field work will further define species' ranges. However, if a specimen is identified and the map shows no specimens have previously been collected within a several county range, perhaps the identification should be rechecked. ON THE COVER: The southern redbelly dace. Photograph by John Woodling. Other photographs in this book, except as otherwise credited, were taken by John Woodling and Don Domenick. Artwork by Annette B. McCollum Vining.