8o UNIVERSITY OF COLORADO STUDIES 



Twin Lakes, and during his investigations at these lakes during the summers of 

 1902 and 1903 he took 24 specimens of the Landlocked Salmon, the largest of 

 which was 23 . 5 inches in length. In Maine this fish reaches a weight of over 

 20 pounds. It is valued as a game fish, although less interesting to the sports- 

 man than some of the other Salmonids. The flesh of the Landlocked Salmon is 

 red, of a firm consistency and a very acceptable flavor. 



Salmo sehago lives in deep water which it leaves in the fall when it runs in 

 small streams to spawn. Its food consists of small fishes, insect larvae and other 

 aquatic invertebrates. 



Salmo irideus Gibbons 

 Rainbow Trout, Coast Range Trout 



Salmo irideus Gibbons, Proc. Cal. Acad. Nat. Sci., p. 36, 1855 (San Leandro Creek, Alameda 

 County, California). 



The Rainbow Trout and its varieties are natives of the Pacific Coast region, 

 ranging from southern California north into Alaska. The Rainbow Trout which 

 has been so generally introduced into the streams of the Rocky Mountains is a 

 variety of the true Rainbow Trout. This variety, 5. irideus shasta (Jordan), is 

 a native of the streams of the Sierra Nevada Mountains in the vicinity of Mount 

 Shasta. Since this trout is quite abundant in the McCloud River and has been 

 distributed from that stream by the United States Fish Commission it has come 

 to be known as the McCloud River Rainbow Trout as distinguished from the 

 true Rainbow Trout. 



Salmo irideus shasta (Jordan) 

 McCloud River Rainbow Trout, Locally " Rainbow Trout" (Figs. 37 and 38) 



Salmo gairdneri shasta Jordan, Thirteenth Bien. Rept. Fish Com. of California, p. 142, 1894 

 (McCloud River at Baird, California). 



Salmo irideus shasta (Jordan) — Juday, Bull. U.S. Fish Com., Vol. XXVI, p. 162, 1906 (Twin 

 Lakes). 



Salmo irideus Gibbons — Jordan, Bull. U.S. Fish Com., Vol. IX, pp. 6 and 16, 1889 (Twin 

 Lakes). 



The McCloud River Rainbow Trout differs from the true Rainbow Trout 

 in having slightly smaller scales, in the more frequent presence of a red coloration 

 on the throat and in not running into salt water. It also reaches a larger size. 



The excellent game qualities and general hardiness of the Rainbow Trout have 

 given them widespread popularity and have led to their successful introduction 

 in many parts of the country. From the standpoint of the sportsman the true 

 Rainbow is perhaps the most interesting of the trout, and the McCloud River 

 variety is but little less of a fighter. It has been stated by several writers' that 

 Rainbow Trout take fewer small fishes and correspondingly more insect larvae, 



" Jordan and Evermann, Amer. Food and Game Fishes, p. iq8, 1902, New York; Chambers Journ. Nat- 

 Fish Cult. Assoc. England, Vol. I, 1889. 



