526 Memoir Sears Foundation for Marine Research 



(cf. Figs. 128, 125) are enough to set It apart at a glance from alpinus. Its minute 

 scales (large and conspicuous in Salmo salar) and the total lack of black markings on 

 its sides distinguish it from S. salar of any size. Reliable field marks that distinguish 

 it from both Salmo gairdneri and S. trutta are the minuteness of its scales and the re- 

 striction of the teeth on the roof of its mouth to a cluster in front of the vomer; In both 

 Salmo gairdneri and S. trutta the teeth extend In a row rearward along the shaft of the 

 bone. There should be no danger of confusing fontinalis with Cristivomer namaycush 

 (lake trout), which has been reported occasionally as taken In brackish water In 

 Hudson Bay, Ungava Bay, and along the coast of northeastern Labrador {yi: 275; 



^-\.-<. 



Figure 128. Salvelinus fontinalis, 236 mm, Little Codroy River, Newfoundland, MCZ 40006. 



j: 295), for the caudal fin of C. namaycush is much more deeply forked than that of 

 fontinalis, Its head Is noticeably narrower, and it has many more gastric caeca. 



Description of Sea-run Specimens. Based on six fish, about 223 to about 262 mm 

 TL and 209— 247 mm (about 8.25 to about 9.75 in.) SL, from the Wllmot River 

 Estuary, on the south coast of Prince Edward Island (p. 525), and on other available 

 information. 



Trunk fusiform, Its maximum thickness about 14— i6"/o of SL, its maximum 

 depth about 19— 2 3''/o; the depth of trunk exclusive of head about 1.2— 1.4 times 

 greater than maximum thickness, the precise relationship depending on the relative 

 fatness of a particular specimen ; the dorsal profile weakly convex, the ventral profile 

 anterior to anal fin only slightly more so, except In especially well-fed specimens 

 or in sexually ripe Individuals in which the sex organs have enlarged. Depth of 

 Caudal peduncle about 10, about twice its thickness. Scales present on body and 

 tail sectors everywhere; head and fins naked; the scales rounded, entirely enclosed in 

 skin, and so minute that they are likely to be overlooked; about 230 along the Lateral 

 line (reported). 



Head about 23—25 */o of SL, its dorsal profile weakly concave between perpen- 

 diculars at upper end of gill opening and posterior edge of eye in some specimens. 



