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-Sa- Western Gambusia (Gambusia affinis). A single specimen was collected in Warm Greek in the spring of 1958. Although not previously reported from the Glen Canyon area, these fish are widely used in Utah for mosquito control. Jonez (1951+) states that gambusia were considered as occurring in Lake Mead in 1942, but due to extreme water fluctuations in the reservoir and other factors are probably unable to exist over the lake for prolonged periods. Largemouth Bass (Micropteous salmoides). Largemouth bass were collected at only one station during the survey. Three specimens ranging in size from 2.5 inches to 7 inches were collected from deep pools in Aztec Creek. Aztec Creek is a relatively large, clear stream with many quiet pools which are considerably deeper (up to l0 feet) than those occurring in most of the other tributaries. The largemouth bass is essentially a species of non-flowing ws.ters such as ponds and lakes and is rather sensitive to low temperatures which cause it to seek deep water. These factors may account for the absence of bass in the other trib- utaries. Although restricted in scope, scale readings from bass collected indi- cate that the growth of bass in this area is relatively slow as compared with Lake Mead or Hiwasse Reservoir, where bass in their third year have an average total length in excess of 13 inches (Jonez 1954 and Stroud). A 7-inch bass taken from Aztec Creek was found to be in its third year. Stomach samples taken from these bass were found to contain parts of small cyprinids. Bluegill (Lepomis macrochirus). A single specimen was collected during the sum- mer of 1958 at Trachyte Creek in a small pool. Green Sunfish (Lepomis cyanellus). In contrast with the Bluegill, this form was found to occur in several of the tributaries, primarily in ponded sections. It was abundant in Warm Spring Creek where it occurred in both the stream and in large ponds. It was not observed in muddy water nor those streams which were very shallow or devoid of pools. Stomach samples indicate that the food of the green sunfish consisted primarily of aquatic insects, bivalves, and small cyprinids. The growth rate of green sunfish in Warm Spring Greek appears to be rather rapid for this species. One 11-inch fish was taken in a deep pool near the mouth of Warm Spring Creek. Although an accurate age estimate was impossi- ble, it was well over five years of age. Yellow Perch (Percy flavescens). A single individual was collected in a muddy backwater at White Canyon. No other yellow perch were observed in the course of the survey.