B 



Fig. 11. Mature whitefish of various species of the Coregonns lavaretus 

 species group inhabiting Swedish lakes. A, spawners of two different species 

 inhabiting the same lake. B and C indicate the phenotypic differences be- 

 tween populations of the same genotype that have developed in different 

 environments. Lower drawing in B indicates phenotype of spawning fish 

 of a certain population. When fry from this population are transplanted to 

 a different lake they develop into mature fish resembling the upper speci- 

 men. Upper figure in C represents a mature fish of a different population. 

 When mature fish of this population were transplanted to another lake, they 

 grew to size of the lower specimen after two summers in the different en- 

 vironment. All figures from Svardson (1949); B after Olofsson (1934); C 

 after Runnstrom (1944). 



113 



