88 THE LIFE OF THE SALMON 
salmon (8. salar) which is more or less spotted about 
the operculum and shoulder, has maggots in its gills, 
and which when cut up is found to be pale in the 
flesh. It is not the bull-trout of the Tweed and 
Coguet, otherwise called the round-tail. These 
Tay bull-trout are not at all uncommon as fish 
of over 40 lb., and the natural presumption seems 
to be that they have their peculiar appearance 
through having adopted a more estuarial habit and 
different feeding than is common with normal S. 
salar. From Tay salmon which have been described 
as bull-trout on recapture eight examples may be 
selected. Four of them show the short period, and 
four the long period; two were described as un- 
spawned grilse on marking. The particulars are of 
some interest, and are as follow : *— 
SHort PERIOD. 
A6 Ib. Kelt after 196 days increased 64 lb. 
” 4 ” ” ” 176 ” ” 64 ” 
» 7% ,, Unspawned Grilse ,, 265 ,, 3 44,, 
” 54 ” ” ” ” 283 ” ” 2 ” 
Lone PERIOD. 
A 14 Ib. Kelt after 556 days increased 19 Ib. 
” 13 ” ”? ” 447 ” ” 4 ” 
6 ” ” ” 556 ” ” 8% ” 
n 12s 5 » 525 ,, ” 132 .. 
Here the uniformity is seen to be in the short 
period fish and a very marked extreme in the long 
period fish, but we must recollect that possibly the 
* “ Arretor,” Proc. Roy. Soc., Edin., XXV. Part I. p. 27. 
