SHELL DAMAGE 



RECAPTURED - TOTAL 



Note: 



Numbers at the top of bars indicate the total number of 

 marked mussels 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 6. Shell damage rates for all mussels recaptured from 



fleeted and unfleeted plots in the Illinois River at 

 Naples. 



33 



