118 BRITISH FISH AND FISHERIES* 



never visit ; while in others, frequented both 

 by the salmon and the sea-trout, it is not to be 

 found. Nor is it the young of the common 

 trout, from which it differs in various anato- 

 mical peculiarities. The young of the salmon, 

 the bull-trout, the common trout and others, 

 have dark transverse marks, which become lost 

 sooner or later, depending on the ultimate size 

 of the species. " Thus," says Mr. Yarrell, " they 

 are soonest lost on the salmon, and on the bull- 

 trout, and are borne the longest on the common 

 trout and parr ; indeed, I have never seen the 

 parr at any age or size without some trace of 

 the remains of these markings. It is this simi- 

 larity in marking and appearance of the fry 

 which has caused the difficulty in distinguish- 

 ing between the various species when so young, 

 and experimenters, believing they had marked 

 young parr only, have been surprised to find 

 some of their marked fish return as grilse, 

 young bull-trout, or whitling, salmon-trout, 

 river-trout, and true parr." Mr. Yarrell alludes 

 to the young of other animals being marked, 

 and ultimately losing markings, which are per- 

 manent in other species of the family ; thus, the 

 young lion and the puma are marked like the 

 young of the tiger, and the young of all deer 

 are spotted, though the greater number of the 



