THE SALMON-TROUT 257 
glimmering, solitary landscape and the cool breath of the 
stream—all these enhance the excitement of catching lovely 
fish, which to angle for in broad day, under existing conditions 
of weather and water, would be a pastime only for lunatics. 
In additon to the sewin (Salmo cambricus) and the salmon- 
trout (S. ¢rutta), which I have ventured to regard respectively 
as southern and northern variants of the same species, Dr. 
Gunther, who omits the bull-trout (S. erioxv) from his list, 
recognises two other migratory species in British waters— 
namely, the grey trout (Salmo brachypoma), which he describes 
as frequenting the Forth, the Tweed, and the Ouse, but 
which I incline to follow Dr. Day in considering no more 
than an adolescent or grilse form of Salmo trutta ; and the 
Galway sea-trout (Salmo gallivensis), which is neither more 
nor less, I believe, than a river trout (Sa/mo fario) with saline 
propensities, causing it to seek food in the estuaries, without 
going out to sea like the regular sea-trout. I am not 
acquainted with the so-called Galway sea-trout, but am very 
familiar with what I take to be a similar fish in Scottish 
streams. ‘This is obviously the common brook-trout, which, 
descending below tide-mark, often when its native burn has 
no estuary, but brawls over shingle and sand into the sea, 
acquires a silvery jacket, but retains some of the spots of the 
inland race. In large estuaries these river-trout attain a very 
great size. One was taken in the Tay on June 25th, 1902, 
weighing 17 lb. 
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