Yellow-fin Trout 



back trout. The 2 are entirely distinct, the size, colouration and 

 habits being notably different. 



The yellow-fin reaches a weight of 8 or 9 pounds while the other 

 rarely exceeds a pound. The former lives on gravel bottom in water 

 of some depth while the latter is a shallow-water trout running into 

 small brooks. The yellow-fin trcut is apparently derived from the 

 Colorado River trout which may be descended from the Rio 

 Grande trout which, in turn, is probably derived from the green-back 

 trout of the Arkansas. 



As a game-fish the yellow-fin trout has attracted much attention 

 from local anglers by whom it is very highly regarded. It is taken 

 chiefly by trolling, though it rises promptly to the fly and is a splendid 

 fighter. 



Head 4; depth 4^ to 5; eye 5^; snout 4!; D. 12; A. n; Br. 10; 

 scales 40-184-37, about 125 pores. Head long, compressed, the 

 snout moderately pointed; mouth rather large, maxillary if to 2 in 

 head; hyoid teeth present; scales small, irregularly placed. Colour, 

 light olive; a broad shade of lemon-yellow along side; lower fins 

 bright yellow; no red anywhere except on throat; posterior part of 

 body, a'nd dorsal and caudal fins profusely covered with small dark 

 spots smaller than the nostril; head and anterior part of body with 

 few spots or none. 



KEY TO SPECIES OF STEELHEAD TROUT SERIES: 



a. Scales rather small, averaging 150 to 155. 



b. Sides bright silvery, usually with a broad flesh-coloured or rosy 



lateral wash, brightest on opercles. Sea-running forms, reach- 

 ing a large size ; gairdneri, 190 



bb. No silvery or rosy anywhere. Probably not sea-running; 



cresccntis, 191 



aa. Scales larger, about 130 to 145. 



c. Sides very" silvery and bright silvery below; a broad band of 



bright light rose colour; spots few; hamloops, 192 



cc. Sides" little silvery; under parts white, not silvery; no rosy lateral 

 band ; beardsleei, 193 



i8q 



