CONTENTS 



Introductory Page xiii 



CHAPTER I 



Smelts 



Early ideas concerning smelts — 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 off 

 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. 30-55 



