TROUT. 97 



The Sea Trout or Salmon Trout, 279, a migratory form of Sea 

 Salmo trutta coming up from the sea into fresh water to spawn, r 

 is a coarser fish than the Salmon (Salmo salar) ; the flesh is not 

 so pink, is of drier texture, and is less richly flavoured. Large 

 specimens of the Sea Trout are known as Bull Trout. The Sea 

 Trout may be distinguished from the Salmon by its smaller and 

 more numerous scales, there being 14 to 16 scales in a line passing 

 downward and forward from the hind edge of the base of the 

 adipose fin as far as the lateral line, not counting the lateral line 

 scale, whereas in the Salmon the number is 11 or 12. The root 

 of the tail is stouter and of more clumsy appearance in a Sea 

 Trout than in a Salmon, and the hind border of the tail fin 

 changes from the concave to the flat, and ultimately to the 

 slightly convex shape, earlier in the Trout than in the Salmon. 

 The anal fin is larger and set farther back, and the anterior fin- 

 rays relatively longer than in the Salmon. The gill-cover has 

 the hind edge more angulate and less semicircular than in the 

 Salmon, and has usually more spots upon it. The side of the body 

 has more black spots below the lateral line than that of the 

 Salmon. When the mouth is closed the hind end of the upper 

 jaw (maxilla) is farther back than in the Salmon, and the first 

 branchial arch has 17 or 18 gill-rakers, whereas that of the Salmon 

 has usually 20. The breeding habits of the Sea Trout are much 

 the same as those of the Salmon ; the Smolts are readily distin- 

 guishable from Salmon Smolts by having yellow pectoral fins. 

 The Grilse of the Sea Trout is known as Phinok. 



The Brook Trout or Brown Trout (280), the variety fario of the Brook 

 species Salmo trutta, is a form which is confined to fresh water, Trout. 

 and lives in brooks, streams and ponds of European countries. 

 In Britain it does not run much over 10 lbs. in weight; in the 

 river Thames in the year 1907 Trout of 8 lbs. were caught on 

 three occasions ; in the same year a Trout was caught in the 

 New River weighing 18 lbs., but fish of this size are very 

 exceptional. 



Salmo alpinus includes the Charrs of Britain, varieties of Charr. 

 which from Buttermere, Windermere, and Sutherland are shown in 

 Cabinet-case 43. The Swiss Charr, 284, the " Omble chevalier " 

 of the Swiss lakes, is a red Charr of the variety umbla. The 



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