Fig. 20. — "Hull Trout" (3]lb. ; from tlie River Alii. 



3rd year. 



2ii(l year. 



1st year. 



Ceutre. 



Fig. 21.— Scale of River Aln " Bull trout " (;4 lb.), indicating 

 orowth .similar to that of a salmon grilse. 



Fresh water life, 2 years; after migration, 1^ years. Age, -i^ years, (x 32). 



See page 65. 



