446 
BULLETIN OF THE BUREAU OF FISHERIES 
catches offpink salmon in the Ankau and also in the Situk, but it is by no means 
clearly shown and when apparent appears to prevail for only a relatively few years. 
Periodicity in the runs of red salmon have been very commonly observed, but is 
not apparent in the Yakutat district either in the separate streams or when the 
catches of this species are considered for the whole district. Nothing is known of 
the age groups making up the run of salmon in any year. It is not known whether 
the Yakutat reds are 4-year fish or more than that age; nor is it known what differ- 
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Figure 2.— Catch of reds and cohos at Ankau River and Slough. 
ence, if any, exists in the age of red salmon of Situk River and those of Ahrnldin 
River, or the other rivers of the district. 
Considering the district as a whole the largest catch of red salmon, which is the 
most important species in the district, was 637,519. This was made in 1912 by the 
use of 1,800 fathoms of beach seines and 9,100 fathoms of gill nets. Five years 
later the catch was 493,348 reds, a decline of more than 22 percent, but the fishing 
effort had changed by a drop of 33 percent in the number of fathoms of seines and 
an increase of 119 percent in the number of fathoms of gill nets. The average length 
of each seine in 1912 was 140 fathoms; in 1917 it was 100 fathoms. In 1912, gill 
