RESULTS OF SALMON MARKING 73 
We therefore select Tay kelts weighing 8-12 lb. 
In doing so we are still, I consider, fairly free from 
the possibility of including fish of another class, so 
long as we restrict ourselves to returns from one 
river ; and in making such restriction preference must 
be given to the Tay, not only because the classes of 
fish are there well defined, but also because the 
numbers of returns are considerable. We are still, 
of course, dealing exclusively with kelt to clean 
fish increases. A fish showing the short period in 
this class is No. 8171. It was seven months 
between marking and recapture, and from a kelt of 
11 lb. had become a summer fish of 17 lb. The 
record is :— 
11lIb. 38” Kelt Fem. Jan. 18,1902 Tay Battleby 
si7i{ ty $5 — Clean Fem. Aug. 20,1902 Tay Estuary nets 
As an example of very rapid growth in the Tay 
we have No. 7780, a kelt of 124 lb., which doubled 
its weight in six months. With regard to the fish 
showing the long period, it may be said that, if they 
are of the same class as the fish just referred to, and 
have spawned in two successive years, their future 
record shows that a salmon may at one time of its 
life adopt the short absence in the sea and afterwards 
stay for the long period. Five fish could beso cited 
which from being kelts of 8-12 lb. have become fish 
of from 19 to 25 lb. in from a year to a year and 
a half. One record may suffice :— 
i 8 lb. 38” Kelt Fem. Feb. 6,1902 Tay Battleby 
8108) 90-3 » 9384” Clean Fem. Aug.18,1903 Tay Estuary nets 
In all these stages we see this same divided 
