length of about 8.5 cm. Similarly, the samples 

 from the 1930 year class in 1930 showed a 

 growth from about 4.5 cm. in July to about 

 9 cm. in September. 



Following the 1930 year class through the 

 second summer (fig. 5, 1931), the modal value 

 progresses from 12 cm. in June to about 16.5 

 cm. in September. Thus, it was possible to 



follow the growth of scup from the small sizes 

 up to the marketable sizes. Applying the same 

 procedure of analysis to the commercial data 

 (fig. 6, tables 6 and 7J, we traced the growth 

 of separate broods up to the end of the fourth 

 summer (about 24.5 cm. or 9,6 inches). Beyond 

 that it was difficult to determine age from the 

 length frequency distributions because of the 

 overlapping of age groups. This method of 



16 



