%s.^ % ' 





F-'ii^-. 22. — " Hull Troiii " (Sib.) from llic Rivfr Aln. 



4th yi-ar 



5nl yc.ir. 



2nd ytijir. 



1st .year. 



Centre. 



■- ^ >j ^■'^■ 



Fig-. 23.--Scale of River Aln " Bull trout" (8 1b.), indicating 

 growth .similar to tlial of a .small sinnmer salmon. { x K).) 



Fresh water life, 2 years; after migration, 2^ years. Age, i^ years. 



Fig. 24. — A Norwegian " Bull Trout " (8^ lb.). 



See pages 65 — 67. 



