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~ ~J .:) 12 ~ ~ Thereafter, specimens were taken from several locations in utah, Colorado, and New Mexico. During a three-year study initiated in 1987, 10 adult and l8 young-of-year specimens of Colorado squawfish were captured. This effort documented the persistence of the species from about Shiprock, New Mexico, downstream to Lake Powell and successful reproduction in New Mexico and utah. Subsequently, nine additional specimens of Colorado squawfish were captured between Shiprock and Four Corners in 1991 and one was observed about 5 miles upstream of Shiprock. Razorback sucker was reported ascending the Animas River in the 1890's, but specimen confirmation of its presence in the San Juan Drainage was not made until 1976 when two adults were found in a floodplain pond near Bluff, Utah. During the 1987-1990 study, adults of razorback sucker were collected in the San Juan arm of Lake Powell and a single male was found near Bluff, Utah. Occurrence of bony tail chub in the San Juan Drainage is uncertain as the record consists only of skeletal remains from Native American middens and two questionable specimens collected prior to 1930. One specimen is a hybrid of roundtail chub and another chub species (possibly bony tail or humpback chub) and the second has not been critically examined. Among the remaining six native fish species, all persist in the drainage. Cutthroat trout (Colorado River subspecies) survives in several isolated headwater tributaries. Roundtail chub is extremely rare in the San Juan and Animas rivers, but may be more common in other streams (Los Pinos, Piedra, and Mancos). Mottled sculpin occurs mainly in the Animas River, but is not common. Speckled dace is generally distributed in the drainage, particularly in upper tributaries, the Animas River, and San Juan River upstream of Bluff. Flannelmouth and bluehead suckers inhabit most reaches of the San Juan and Animas rivers as well as lower reaches of some tributaries.