1 — I — r 1 ' 



. ' . '■ . ' A 1 ' 1 J. J. ' ■ J. ■ ■ 



- .-■■■»■■ 



«r*- 



WIDTH OF MARGINAL ZONE ID HLLMETCRS OF mOJCCTCO IHAM 



■lm> ap<vf-n*a ci-Aii mf 



Figure 7» Ptequencies of marginal increment iridtha in otoliths assigned 

 to year classes 1936, 1937, 1938. Dimensions are in millimeters of 

 projected image j the magnification is 125 diameters. Die boundary 

 between narrow and -wide increments is taken as 35 mnu of projected 

 image for specimens of year cHass 1938 j 20 nm. for those of 1937 j 

 and 15 mm. for those of 1936* 



70 



