4 CONTENTS 



Young salmon in fresh water — Continued. • Pagft 



Dog salmon 47 



Humpback salmon 48 



Trout and charr 48 



Sea habits of young salmon 50 



Notes afforded by collections and records 50 



The sockeye 50 



King salmon , 53 



Coho 53 



Dog and humpback salmon 55 



Conclusions from available data 57 



Abundance of food 57 



Return of adults to fresh water , 59 



Approach of schools 60 



Food and feeding 61 



The sockeye 61 



King salmon 64 



Coho 64 



Humpback and dog salmon 65 



Relation of food supply to number of adult salmon 65 



Age of adult salmon 66 



Salmon-marking experiments 66 



Methods 66 



Regeneration of lost parts 67 



Salmon in the Trocadero, at Paris 68 



Factors influencing return to fresh water 69 



, Sex instincts versus condition of nutrilion 69 



The different runs 70 



Temperature 71 



Currents 73 



Ascent of streams 74 



Interval between arrival and spawning 75 



Parent streams 76 



"Introduction into streams not previously frpciucntcd" 77 



' 'Return of marked salmon" 78 



' 'Distinctive and characteristic runs' ' 78 



Variations in weights and measurements 79 



Variations in counts 89 



Streams not utilized by sockeyes 92 



Relation of size of run to spawning area 93 



Selection of spawning ground 94 



Conditions required by the sockeye - - . - 94 



Preferences of the king salmon 96 



Spawning streams chosen by the coho, dog. and humpl:>ack salmon. . . 97 



Nature of spawning beds selected - - - 98 



Deposit of eggs 99 



Completeness of spawning JOO 



Percentage of natural production 101 



Relation of spawning habits to number of fish". 102 



Changes incident to maturation 104 



Return of adults to salt water 106 



Enemies of young salmon 107 



Geographical glossary 109 



