CLASSING OF MIGRATORY SALMONIDJE 275 



matters. We thus find that there are but three 

 varieties of the Salmonidae in Britain which are 

 migratory, and that they are these : 



1. The salmon. 



2. The bull-trout, otherwise called the sewin, 

 whilling. 



3. The sea-trout, otherwise called salmon-trout, 

 white-trout, peal. 



It may be asked, What are the differences 

 between the salmon, the bull-trout, and the sea- 

 trout ? 



Between the first two there is, to a person 

 ignorant of such matters, scarcely any difference 

 at all. Indeed, so slight is it that even experi- 

 enced fishmongers are often unable to detect it, 

 and numberless bull-trout are old in all good 

 faith by them as being true salmon. Bull-trout, 

 however, very rarely attain to over seventeen or 

 eighteen pounds in weight, so that any fish over 

 that size may safely be assumed to be a true 

 salmon. The flesh of the bull-trout is, however, 

 inferior to that of the salmon. Yarrell, who has 

 gone more deeply and scientifically into the 

 subject than any other author, either before or 

 since, explains that, apart from other less definite 

 distinction, the gill-covers of the three fish are 

 very different in shape, that of the salmon being 

 circular, that of the bull-trout nearly triangular, 

 and that of the sea-trout being partly circular and 



