694 
BULLETIN OF THE BUREAU OF FISHERIES 
Sockeye Salmon — Continued. Page 
Introduction 754 
General life history 754 
Spawning 754 
Age at maturity 755 
Sockeye rivers of the region 756 
Outer coast streams 756 
Puget Sound streams 757 
Gulf of Georgia streams 757 
Migration in salt water 758 
Total pack of the Fraser River sys- 
tem 758 
Method and locality of capture 759 
Indian fishing in the Fraser 759 
Extent of the Indian fishery 760 
Catch by commercial gear 760 
Locality of trap catches 762 
Locality of purse-seine catches.. 762 
Changes in abundance of different 
portions of the run 763 
Changes in abundance 765 
Average catch per unit of effort 
with gill nets 766 
Index of abundance from traps... 767 
Purse seines 769 
Combined index of abundance.. 772 
Explanation of changes in abun- 
dance 772 
Abundance of cycle ending 
in 1934 774 
Abundance of cycle ending 
in 1933 775 
Abundance of cycle ending 
in 1932 777 
Abundance of cycle ending 
in 1931 778 
Coho Salmon. By George B. Kelez 781 
Introduction 781 
Life history 781 
Spawning 781 
Growth 782 
Age at maturity 783 
Individuality of populations 783 
Locality of capture by different types 
of gear 784 
Catches in various districts 784 
Locality of trap catches 785 
Seasonal occurrence in various areas. 786 
Page 
Coho Salmon. Changes in abundance 789 
Calculation of trap indices 789 
Calculation of purse-seine index. 792 
Trends of abundance 794 
King Salmon. By George B. Kelez 795 
Introduction 795 
Life history 795 
Locality of capture by different types 
of gear 797 
Catches in various districts 797 
Locality of trap catches 798 
Seasonal occurrence in various areas. 799 
Seasonal occurrence of red and white 
king salmon 800 
Changes in abundance 803 
Pink Salmon. By George A. Rounsefell.. 804 
General life history 804 
Migration 805 
Method and locality of capture 805 
Seasonal occurrence in northern and 
southern districts 808 
Changes in abundance between early 
and late years 808 
Indices of abundance from traps 811 
Abundance from purse-seine catches. 812 
Comparison of purse-seine and trap 
indices 812 
Chum Salmon. By George A. Rounsefell. 813 
General life history 813 
Method and locality of capture 814 
Seasonal occurrence in northern and 
southern districts 814 
Abundance from Admiralty Inlet 
traps 815 
Abundance from purse seines 815 
Summary. By George A. Rounsefell and 
George B. Kelez 817 
The gill-net fishery 817 
The trap fishery 817 
The purse-seine fishery 818 
The troll fishery 818 
Sockeye salmon 819 
Coho salmon 819 
King salmon 819 
Pink salmon 820 
Chum salmon 820 
Bibliography 820 
INTRODUCTION 
By George A. Rounsefell and George B. Kelez 
The decrease in abundance of sockeye salmon in the waters of Swiftsure Bank, 
Puget Sound, and the Gulf of Georgia has been readily apparent, but no previous 
attempt has been made to measure accurately this change, nor has the decline of 
other species been previously demonstrated. The studies included in this report on 
the seasonal occurrence of each species, and the history and development of each 
form of gear, were necessary in arriving at logical conclusions as to the causes and 
extent of the changes in abundance that have occurred. The interrelations of the 
various species of salmon and the different types of gear in this region are such that 
the problem cannot be understood unless all of these factors are considered. Not 
since the general report in 1899, entitled “A Review of the Fisheries in the Contiguous 
