ON THE COMPETITION BETWEEN WHITEFISH SPECIES 327 



100 



50 



50 



Voj m sj o n 



C.pidschian 



J 



1_ 



C. peled 



n 



\. 



fj 1 



f 



\ 



15 20 



25 30 



35 



40 



45 



50 



C.pidschian 



Uddjaur- storavan 



C. lavareLus 



C.peled 



M 



iL 





100 



50 



U ] 



50 



15 20 25 30 35 40 



Number of gillrakers 



45 



50 



Fig. I. — Frequencies for different numbers of gillrakers. The best way to identify a whitefish 

 population is to count the gillrakers of the members. Modified from Svardson, 1957. 



ethological community effects other than direct food competition that 

 might influence both survival and individual growth (Blaxter & Holliday, 

 1958). 



The present example of competition belongs to freshwater fish ecology. 

 In a survey of this field, Larkin (1956) concludes that 'many species have a 



