38 Proceedings of Royal Society of Edinburgh. [sess. 
I am indebted to Sir Richard Waldie Griffith, Bart., Chairman 
of the Tweed Commissioners, for specimens in spawning condition 
taken later in the year. 
Though the Tweed trout cannot, in my opinion, be regarded as 
a species distinct from trutta , it is perhaps the best-defined variety 
of migratory trout in the British islands, and on this account 
might well, I think, retain the distinguishing name of eriox , in 
contradistinction to the variety cambricus. I am not familiar with 
the trout of the Coquet, but there seems no reason to doubt that 
the Tweed trout and the Coquet trout are of the same local race, 
and that Berwickshire and Northumberland form, as it were, the 
headquarters of the variety. Moreover, the history of the local 
fisheries seems to show that this variety has almost entirely super- 
seded the sea trout proper. A point upon which more information 
is required is the relative distribution of this fish at the mouths of 
many of our Highland rivers, as referred to recently by Mr Harvie- 
Brown ( Fishing Gazette , Oct. 10, 1903). In the Tweed, clean bull 
trout have been taken in January during netting for experimental 
purposes ; and although the greatest runs are in early summer, and 
especially in late autumn, a certain number of fish are entering fresh 
water all the year round. They affect certain tributaries more than 
others, but push up to high spawning grounds. 
In particulars of Estimated Annual Produce of the Eisheries of 
the River Tweed from 1808 to 1894, it appears that, whereas at 
the beginning of that period trout were less numerous than either 
salmon or grilse, in process of time trout became more numerous, 
first than salmon, and afterwards than grilse. 
In 1808 the figures are 37,333 salmon, 25,324 grilse, and 
21,033 trout. In 1844, the year of the maximun trout crop, there- 
were 21,830 salmon, 88,003 grilse, and 99,256 trout. In 1894 we 
have a marked shrinkage, viz. — 3271 salmon, 7877 grilse, and 
18,535 trout. 
The surprising manner in which this trout has asserted itself 
leads us more clearly to understand the well-defined character 
which the variety eriox now exhibits. 
{Issued separately January 30 , 1904 .) 
