143 



1355 



123 



1 13 



103 



93 



83 



73 



63 



53 



43 



33 



23 



13 



03 



MUSSEL MORTALITY 



RECAPTURED - TOTAL 



DOWNSTRM 



GROUNDED 



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 8, 



Mortality rates for mussels recaptured from fleeted and 

 unfleeted plots in the Illinois River at Naples. 



35 



