448 
BULLETIN OF THE BUREAU OF FISHERIES 
the new regulations became effective. The catches in the 3 years 1925 to 1927 
were, however, considerably below the level that had been maintained since 1905. 
In the Ahrnklin River the catches of red salmon have steadily declined from the 
peak year of 1911 to 1927. In the Alsek the fluctuations were very wide during 
the early history of the fishery (perhaps due to faulty data but probably on account 
of fluctuations in fishing effort) and it is difficult to say whether the catches up to 
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Figure 4.— Catch of reds and cohos at Ahrnklin River and Slough. 
1925 showed marked reduction or not, although it appears rather probable that they 
did. The data on the other streams, Italio, Akwe, and Lost Rivers, show no very 
marked tendencies. 
The evidence of depletion in certain of these streams is borne out by the evi- 
dence of general depletion in the red-salmon runs of the district as a whole. The 
data and a moving-average trend are shown in figure 10. From this it is apparent 
that moderate reduction in catch had already occurred by 1925 at which time the 
regulations first became really effective. The situation as regards the red-salmon 
