GROWTH (LENGTH) 



AMBLEMA PLICATA 



DOWNSTRM 



GROUNDED 



PILINGS 



Note: Numbers at the top of bars indicate the total number of 

 live, undamaged, marked Amblema plicata recaptured at 

 the plot in 1984. 



DOWNSTRM = unfleeted plot, downstream control 



GROUNDED = fleeted plot, barges against shore 



PILINGS = fleeted plot, barges tied to pilings 



Figure 10. Growth rates (shell length) of Amblema plicata between 

 June and October in fleeted and unfleeted plots in the 

 Illinois River at Naples. 



39 



