CONTENTS. 



Page 



Preface . 5 



Introduction 7 



Taxonomic considerations 7 



Genera of Salmonidse 9 



Geographical distribution of genera 10 



Species of Salmonidse 11 



Origin of species of Salmonidae 14 



'Plasticity' of Salmonid£e 17 



The Atlantic salmon {Salmo salar Linne) 17 



General considerations 17 



Names applied to life stages 19 



Size attained by salmon 19 



Geographical distribution 21 



Marine habitat 24 



Movements of salmon in the sea 25 



Salmon taken in Casco Bay, Maine, by traps, nets, and pounds 28 



Young salmon in the sea 30 



Records of salmon caught in the sea 31 



Feeding habits 33 



Feeding in the sea 33 



Feeding in fresh water 35 



Anadromy 37 



General considerations 37 



Manner of migrations from the sea to rivers 45 



Time and manner of ascent of rivers 47 



Races of salmon and parent stream theory 49 



Life history of the salmon 51 



Methods of study 51 



Years in the sea 53 



Grilse 54 



Years in the river 55 



Scale readings of Maine parr and adult salmons 57 



Relation of the river life to the subsequent life of the salmon 61 



Breeding habits 65 



The kelt and mortahty after spawning 69 



Duration of sea life and increase in weight after spawning 71 



Maine marking experiments 73 



Canadian tagging experiments with spawned salmon 75 



3 



JAN 1 3 1939 



