ie Sea- Trout 
experience in dealing with them have no trouble whatever in dis- 
tinguishing them at a glance. In marking the salmon smolts we are 
not aware of having made a single mistake in this connection, although 
there were plenty of yellow-fins also in the net, and no wired sea-trout 
have been caught. Although, too, the smolt of the sea-trout are called 

F1G. 123.---Sea-trout, showing scales from the adipose fin to the lateral line. 
The four specks are sea-lice. 
yellow-fins, they have not all yellow fins: some of their fins are almost 
as dark as those of a salmon smolt (Fig. 125). Asa rule, the yellow- 
fins are larger than the salmon smolts, and this may be accounted for 
by the fact that the former are from a month to six weeks older, and 
therefore have an earlier start than the salmon smolts. 
I am of opinion that the yellow-fins do not go far out to sea 
before returning as whitling (Fig. 126) about the end of June. 
During the whole season we catch them, in the estuary, in all stages 
