SALMON AND SALMON FISHERIES OF SWIFTSUEE BANK 
803 
RED AND WHITE KING SALMON 
SEASONAL OCCURRENCE 
“i r 
NORTH OF 
SANDY POINT 
AJ. 
CHANGES IN ABUNDANCE 
Traps are the only major gear taking king salmon for which sufficient data are 
available for any determination of changes in abundance of this species. The records 
of this gear are inadequate 
prior to 1910, but the fol- 
lowing calculations are pre- 
sented as the best measure 
which can be determined 
from present data. 
The data were necessa- 
rily restricted, because of 
fishing seasons of varying 
lengths, to include only those 
traps for which the opening 
fishing dates for each season 
were known . The catches of 
all traps were then weighted 
according to the length of 
the season fished in a man- 
ner similar to that discussed 
under the trap index for 
coho salmon. 
Suitable data from the 
area north of Sandy Point 
were available for the period 
from 1910-34. During 
these years, from 6 to 11 
traps fished in each year 
except 1932. Four of these 
traps were in Birch Bay, 4 
in Bounday Bay, and 3 at 
Point Roberts. During the 
same period of time, data 
were available from 2 traps 
in Rosario Strait for every 
year except 1910. In Admiralty Inlet, data were available between 1916 and 1934 
from 4 traps, at least 2 of which fished in every year except 1916 and 1932. The 
number of traps fishing in each area, and their combined catches, are presented 
in table 46. 
Figure 28.— Seasonal occurrence of red and white king salmon in trap catches of the 
northern and southern districts of Puget Sound. The greater abundance of white 
kings and the heavy late-season run in the northern district are apparent. 
71941—31 
-8 
