THE SALMON FAMILY 59 
In the young salmon the head is shorter than in that 
of the brown trout; there are nine or ten finger marks 
across the body, and the adipose fin is slaty blue in 
colour. 
The sea-trout has the same number of markings, but 
the adipose fin is orange tipped. 
In the brown trout there are usually only six or seven 
finger marks, and the adipose fin is red in colour. 
Salmon parr and trout fry differ slightly in their 
methods of feeding, for salmon parr feed mainly on 
food under the stones, whereas trout fry feed on food 
carried along in the water. 
Returning to the salmon parr, we left him two or 
three inches long at the end of his first summer. During 
the winter the little fish lives in a comatose state under 
a stone, and takes no food. In the early spring he again 
emerges as a dark, lanky little fish, but as the water 
becomes warm, parr again assume their active habits 
and make their way up every little stream, and swarm 
in the shallow running waters of salmon rivers. During 
their second summer parr double their weight; but 
when winter arrives they again retire into shelter. 
In the following spring, that is, when the parr is just 
over two years old, the little fish gather together in 
shoals, and a complete alteration takes place in their 
appearance, for the back becomes of a dark bluish shade, 
and the sides a silvery hue. The parr is now described 
6G 
as having put on his “sea jacket,” and is known as a 
smolt. 
