THE SALMON FAMILY. 315 



Trout the spots are in each case surrounded by a paler 

 ring, sometimes of a reddish hue. 



The flesh of the Lochleven Trout is deep red in 

 colour, that of the Great Lake Trout generally orange- 

 yellow, and the flesh of the common Trout pink or 

 white, according to the nature of the water and the 

 condition of the fish. 



3. Length of head. The disproportionate size of the head 



in the Great Lake Trout is very remarkable, it being 

 little less than one-fourth of the total length of the fish, 

 tail-fin included, whilst in the other two species it is 

 not much more than one-fifth. The length of head in 

 the Great Lake Trout is also greater than the depth of 

 the body at the deepest part, whilst in the common 

 Trout it is less, and in the Lochleven Trout about 

 equal. 



4. Tail-fin. -The tail-fin in the Great Lake Trout (as 



shown in the engraving, p. 334) is nearly square at the 

 end, and is considerably wider than the widest part of 

 the body, whilst in the other two species it is very 

 obviously narrower than the same measurement. 



By bearing these characteristics in mind, the Angler will 

 be at once able to distinguish the species to which his fish 

 belongs. Upon any other mere external peculiarities of 

 colour or shape very little dependence should be placed, as 

 these are liable to constant variation with differences of 

 water, food, or season. 



