SOUTHEASTERN ALASKA SALMON STATISTICS 
471 
going on. During this period there was evidently a supply of chums greater than any 
demand that was then made so that in years in which pinks were scarce it was easy to 
increase the pack of chums. There is considerable evidence of such an interplay of 
factors, both biological and economic, affecting the catches of these species. The 
Figure 13. — Catch of salmon in the Icy Strait district, 1900 to 1927. 
increased demand for chums in 1912 may be ascribed to a relative scarcity of pinks 
since the catch of pinks in that year was only a little over 1 )i million as compared 
with over 2 million in 1911 and over 3% million in 1913. The catch of chums dropped 
again in 1913 presumably due to this relative abundance of pinks and the low prices 
which then prevailed for the canned product. 
