Fig. 20.-- Bull Tn.uf (3] lb.; from the River Ain. 



3rd year. 



2iid year. 



't year. 



Centre. 



Fig. 21. -Scale of River Aln " Mull iroui " (,:;J lb.), indicating 

 growth similar to ihai of a .salmon grilse. 



Fresh water life, 2 years; afU-r migration, I^ years. Age, 3i years, (x :«). 



Set- page 05. 



