SHELL DAMAGE 



RECAPTURED AMBLEMA PLICATA 



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

 recaptured Amblema plicata which were alive when 

 placed in the plot in 1984. 



DOWNSTRM = unfleeted plot, downstream control 



GROUNDED = fleeted plot, barges against shore 



PILINGS = fleeted plot, barges tied to pilings 



Figure 7. Shell damage rates for Amblema plicata recaptured from 

 fleeted and unfleeted plots in the Illinois River at 

 Naples. 



34 



