Expose 

 mussels. 



Initial Yeast 



Concentration 



(YO) 



Measure initial 

 yeast 



concentration, 

 and then allow 

 mussels to filter 

 for 4 hours. 



(g) 



(YO - Y4) / g mussel / 4 hours = Filtering Rate 



Figure 3. Schematic drawing representing the steps of the mussel filtering assay. 

 Diagram depicts the modification made to original assay of Sparks and Dillon (1993) where the 

 yeast-control was removed. The removal of the yeas-control resulted in more realistic filtering 

 rates for the mussels in our study. 



17 



