Figure G-1. Growth curves based on the average observed size at age (Table G-5) of Amblema plicata 

 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 GA).^ 

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

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



I ' ' ' I ' ' ' I ' ' ' I 

 8 12 16 20 24 



Estimated age (yrs.) 



110 



Length (r^ = 0.9904); ••5- Height (r^ = 0.9908); \ Width (r^ = 0.9908) 



T 



12 16 20 24 



Estimated age (yrs.) 



Page G-23 



Whitney et al., Unionid Survey - Reach 15 UMR 



