Figure G-5. Growth curves based on the average observed size at age (Table G-9) of Quadrula metanevra 

 collected from Reach 15 of the Upper Mississippi River in 1987. All growth curves were best 

 described by a polynomial regression formula (Table G^). 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. 



3 

 C/5 



Length (r^ = 0.9737); "q Height (r^ = 0.9705); V Width (r^ = 0.9725) 



T 



8 12 16 20 24 



Estimated age (yrs.) 



Page G-27 



Whitney et al., Unionid Survey - Reach 15 UMR 



