Mean densities and standard deviations were determined for 

 each transect line and for all transects in the fleeting area 

 combined. 



STUDY PLOTS 



Barges at the Naples Terminal Company are fleeted by one 

 of two methods. Some are moved in against shore and attached 

 by cables to cement deadmen located farther back on the shore. 

 At least the inside edge of the barge nearest shore is 

 grounded. We refer to this type of fleeting as grounding. The 

 second method is to tie the barges to off-shore pilings in deep 

 water. We identified four different study plots: two within 

 the fleeting area to be used as experimental plots and two 

 control plots outside the fleeting area. Thus mussels were 

 exposed to one of three possible treatments: 



1) control - no fleeting, 



2) experimental - fleeting where barges are tied to pilings 



3) experimental - fleeting where barges are grounded. 

 Both fleeted plots were near river mile 65 (Figure 2) . The 



first was on the west or right bank (facing downstream) where 

 barges are grounded. The second was on the east or left bank 

 where barges are secured to pilings. One control plot was 

 approximately 4 km below the lower end of the fleeting area and 

 close to the right bank near river mile 62, and the other was 

 upstream on the left bank near river mile 67 (Figure 1) . 



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