260 



SALMON OF THE KARLTJK RIVER, ALASKA 



it is obvious that the catches made during the early days of the fishery were such as to 

 cause serious depletion of the population, it would seem likely that the fishery could 

 have been stabilized with a yearly catch of 1,500,000 to 2,000,000 fish. 



24 



20 



16 



12 



V) 



Q 





3 

 O 



o 



-8 



-12 



o 



/o 



12 



14 



2 4 6 8 



ESCAPEMENT 

 (in hundreds of thousands) 



Figure 4.— Surplus (return minus escapement) produced by spring and fall escapements for the years 1921 to 1929, inclusive. 



CHEMICAL ANALYSES OF LAKE AND STREAM WATERS 



A factor to be considered in relation to the optimum magnitude of the escapements 

 of red salmon is the addition to the lake water of phosphorus and other inorganic salts 

 from the bodies of the fish which migrate into the watershed to spawn. Prior to the 



