THE SALMON FAMILY. 279 



brown; and the sides are indistinctly crossed by nine or 

 ten transverse dusky bars, or Parr-marks, characteristic 

 of all the species of the genus Salmo when in an immature 

 state, and which in the true Salmon remain more or less 

 visible even in a Smolt or Parr 6 inches long. If the scales 

 are removed, the marks are much more obvious. It has 

 been observed that this similarity of marking, or family 

 likeness, in the young of various species of the same genus, 

 however different may be the colours of the parents, is not 

 confined to Salmon and Trout, or to fish as a class, but 

 is equally noticeable amongst other classes of the Animal 

 Kingdom. The young of the lion and the puma are as 

 much marked for a time as those of the tiger or leopard, 

 or indeed any of the other felines, whether striped or 

 spotted ; and the young of all deer are said, and many are 

 known, to be spotted, though it is also known that the 

 greater number of the adult animals are perfectly plain. 

 The differences in appearance, in fact, between the fry of 

 the Salmon, BuU-Trout, and Sea-Trout, and probably also 

 between the fry of the other species of the same genus, 

 are so trifling as to be scarcely perceptible unless upon very 

 close examination, and are, moreover, liable to constant 

 variations with local circumstances. According, however, 

 to Sir William Jardine, the fry of the common Trout {Salmo 

 fario) may always be distinguished from that of either of 

 the three migratory species by its having the extremity of 

 the second dorsal or adipose fin fringed with orange — a 

 mark easily identified. 



