338 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



annulus i 

 annulus n 



annulus in 



annulus iv 



? 



Figure 23. — Scale of a grayling of indeterminate age (total length 12.8 ins.) captured May 24, 1954. Fish is starting 



either its fourth or fifth summer. 



total length during 1 year (September to Sep- 

 tember), 59.4 percent did not form a year mark. 



Failure to assess age beyond III was not experi- 

 enced by Brown (1943), Miller (1946), Nelson 

 (1954), or Greaser and Greaser (1935). However, 

 a scale photograph by Brown (1943) from a pre- 

 viously collected sample of Grebe Lake grayling 



is suggestive of a problem not unlike one presented 



by this study. 



Growth of Young Grayling 



Growth in the first 2 years was determined 

 empirically by measurements of samples taken at 

 intervals through the growing season until Sep- 

 tember 1, 1954. Plots of average lengths at time 



