CONTENTS 



INTRODUCTORY . . . . . . . . Page xiii 



CHAPTER I 

 Smolts 



Early ideas concerning smolts Rearing of smolts in captivity 

 Marine versus fresh water origin of the salmon 

 Hatching fry from smolt eggs British smolts descend 

 when two years old Marking of smolts Habits in migrat- 

 ing to the sea Autumn migrations Development of 

 smolts in sea Herr Dahl's capture of smolts in the sea ofi 

 Norway ' ... Pp. 1-29 



CHAPTER II 



Grilse 



Return of marked smolts as grilse the following season Habits 

 of grilse in the sea Ascent of grilse from the sea Habit 

 of many to remain in sea beyond grilse stage Small spring 

 fish The spawning of grilse Ascent of grilse when in 

 poor condition Argument in support of the marine origin 

 of the salmon Entrance of salmon to fresh water not 

 entirely explained by condition of satiety Reproduction in 

 fresh water Possible transference of small fish from one 

 river to another Movements of marked grilse along coast 

 of Scotland Pp. 80-55 



60258 



