CONTENTS. 



Page 



Introduction 73 



Material and methods of investigation 74 



Types of salmon muscular tissue as regards the storage of fat 78 



Normal loading of fats in the muscles of the king salmon at the time the spawning migration 



begins 80 



Protocols 84 



Variation of the amount of fat in the salmon during the spawning migration 86 



Distribution of the fats of the salmon muscle at tide water 87 



Analytical determinations of the percentage of fats in salmon from the mouth of the Colum- 

 bia River 91 



Protocols 93 



Distribution of the fats at an early intermediate stage of the spawning migration 98 



Protocols 102 



Distribution of the fats at a late intermediate stage of the spawning migration 108 



Protocol 109 



Fat in the tissues of salmon from the spawning grounds in 



Analytical determinations of the percentage of fats in the spawning salmon 1 14 



Protocols 115 



Significance of the observed changes of the amount of fat 118 



Transportation of fats in the fasting salmon 119 



Historical 1 19 



Mechanism of fat transference in the salmon body 124 



Transference of fat in the pink muscle 125 



Transference of fat in the dark muscle 127 



Relative abundance of stored fat and its disposal in the organs 129 



Salmon lipases 13° 



Source of the lipases 131 



Resume 136 



Explanation of plates 137 



71 



