Figure G-4. Growth curves based on the average observed size at age (Table G-8) o^ Qiiadnila pustulosa 

 collected from Reach 15 of the Upper Mississippi River in (a) 1994-95 and (b) 1987. All 

 growth curves were best described by a polynomial regression formula (Table G-4). 

 Coefficient of determination (r^) values for each growth curve are listed. Minimum commercial ' 

 shell height (Illinois) and average age at sexual maturity (Table G-2) are also shown. 



110 

 100 

 90 

 80 

 70 

 60 

 50 

 40 

 30 

 20 

 10 

 





8 12 16 20 24 28 32 36 



Estimated age (yrs.) 



Length (r^ = 0.9951); •5' Height (r^ = 0.9940); V Width (r^ = 0.9937) 



8 12 16 20 24 28 32 36 



Estimated age (yrs.) 



Page G-26 



Whitney et al.. Unionid Sunev - Reach 15 UMR 



