THE SALMON FAMILY. 



301 



of lower jaw, one line on each side of tongue (occasionally two lines on 

 each side of tongue). See also p. 246 for differences between teeth in 

 Salmon, Sea-Trout, and Bull-Trout. For distinctive shape of gill- 

 covers in the three species, see p. 245 ; and for shape of tail-fins at 

 various ages in the same, p. 247. Relative position of other fins : 



SALMON. 



Dorsal fin : Hinder 

 origin about half- 

 way between point 

 of nose and end of 

 tail-fin. Third ray 



Adipose fin : Hinder 

 origin half-way be- 

 tween origin of last 

 back-fin ray and end 

 of tail-fin. 



BULL-TROUT. 



Commences about 

 half-way between 

 point of nose and 

 origin of upper tail- 

 fin rays. Base of 

 dorsal longer than 

 longest ray. 



Nearer to end of tail- 

 fin than to origin of 

 last dorsal fin ray. 



SEA-TROUT. 

 Hinder origin exactly 

 half-way between 

 point of nose and 

 end of tail-fin. Se- 

 cond ray longest, 

 same length as base 

 of fin. 



Half-way between ori- 

 gin of last ray of 

 back-fin and end of 

 tail-fin. 



To the above it may be added, that in the Salmon the pectoral fin 

 equals two-thirds of length of head, whilst in the Bull-Trout it equals 

 little more than half, the anal fin also in the former commencing about 

 halfway between origin of ventral fins and origin of lower tail-fin 

 rays, and in the latter nearer to the tail. Colours of Salmon : as Parr, 

 see p. 279; as Smolts, p. 283-4; as Grilse and Salmon when in con- 

 dition, p. 249; when out of condition, (before spawning) p. 260, (after 

 spawning) p. 267; as ' well-mended Kelts,' p. 271. 



Fin-rays : D. 13 : P. 12 : V. 9 : A. 9 : C. 19. Vertebra, 60. 



