Blueback Trout of Crescent Lake 



Both large fish were taken just as the boat started up, after one 

 of three brief stops, during which the troll had gone down to a 

 greater depth than when the boat was in motion." 



The blueback trout reach a large size. Four examples caught 

 by Admiral Beardslee weighed, 6, n, 1 1|, and 1 1 pounds re- 

 spectively. One taken by Miss Beazley measured 29! inches long 

 and weighed strong 10 pounds. Another caught by Mr. Ben. 

 Lewis, and forwarded by Mr. M. J. Carrigan, of Port Angeles, to 

 Stanford University, was 32 inches long, and weighed 14 pounds. 



Head 3f; depth about 4; eye 4f in head, if in snout; snout 

 3f; D. 10; A. n; scales 24-130-20 , about 70 series in front of dor- 

 sal, counting along median line, or 60 if rows along upper side 

 are counted; Br. n; gillrakers 8+13, rather long and slender. 

 Head pointed, mouth rather large, maxillary extending to posterior 

 margin of eye, if in head, with about 20 teeth; preorbital very 

 narrow, the maxillary almost touching the orbit; several large 

 teeth along side of tongue; no hypid teeth; teeth on vomer in 

 zig-zag series; origin of dorsal at middle of length; origin of anal 

 midway between that of dorsal and base of caudal; caudal broad, 

 nearly truncate. Colour, on the back a deep dark-blue ultra- 

 marine of a peculiar transparency, dotted with small round black 

 spots about the size of a pin head; side abruptly brighter, with 

 many scales silvery; lower parts white; sides, top of head, dor- 

 sal, and caudal fins covered with very small spots; pectorals and 

 ventrals nearly colourless, without spots"; adipose fin with 2 spots; 

 no red on lower jaw. 



The flesh is light lemon-colour before cooking, during which 

 process it whitens. It is devoid of the oily salmon flavour, and 

 is very excellent. 



KEY TO SPECIES OF RAINBOW TROUT SERIES: 



a. Scales well imbricated; upper ray of pectoral usually more or 



less spotted. 



b. Scales comparatively large, 120 to 150 series. 



c. Scales decidely large, in 120 to 130 series; body elongate; no 



red on throat. Brook forms, mostly of small size; sea-run 

 examples occasionally large; confined to streams of the 

 Coast Ranges. 



d. Mouth moderate. Coastwise streams of California; 



irideus, 195 

 dd. Mouth very small. Coastwise streams of Oregon and 



Washington ; masom, 197 



cc. Scales medium, in about 140 series; body rather deep; a 



small dash of red usually present on the throat. Size 



194 



