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i ' Report on Fishes of the Colorado River Drainage Between Lees Ferry and Surprise Canyon, Arizona Fishes were collected and observed between July 7-21, 1975, during an ecological survey operated by the Museum of Northern Arizona and sponsored by the .II. S. National Park Service. Because of very high xater and unusually lox water temperatures, collecting in the main river was difficult. Never- the-less, important information on native and exotic species was obtained. Twenty-one stations xere made. The native fishes that have been actually collected or reliably recorded from this section of the river and the lower parts of mayor tributaries during the past forty-five years are as follows: Family Catostomidae Suckers Catostomus latipinnis Baird and Girard. Flannelmouth sucker. Pantosteus discobolus (Cope). Bluehead sucker. Family Cyprinidae Minnows ;• Gila elegans Baird and Girard. Bonytail -Gila cypher Miller. Humpback chub. Ptychocheilus lucius Girard. Colorado squawfish. Rhinichthys osculus (Girard). Speckled dace. Exotic species include: threadfin shad (Dorosoma petenense, Surprise Canyon only), rainbow and brown trout (Salmo gairdneri and trutta), Coho salmon (Oncor- hynchua kisutch,, 1 taken by Suttkus at RH 19Lc.5, 16 Aug. 1971), carp, fathead minnox (Pime_ promelas), red shiner (Notropis lutrensis), channel catfish ~J~~ns X.l;ris~j (~tc,x~~-/~~ ze6ririHS) (Ictalurus punctatus), black bullhead (Ictalurus melas), and green sun~is~- (L°pomis cyanellus, Surprise Canyon only). No doubt other exotics occur in or near Surprise Canyon (RM 248.6) as this locality is virtually at the upper end of Lake Mead.