factors for mortality should be developed for each species in 

 both fleeted and unfleeted plots. 



Growth 



Growth rates are reported as increase in shell length in 

 centimeters per month. Mussels that were already damaged when 

 initially found and those that died before recapture were not 

 used in analyses of growth. 



STATISTICAL ANALYSES 



Four types of statistical tests were used to determine 

 whether there were significant differences in shell damage, 

 mortality, and growth rates in mussels recaptured from fleeted and 

 unfleeted areas. We used Fisher's exact test (2-tail) to 

 determine if mortality and damage were independent of "treatment", 

 that is, exposure to fleeting or no exposure to fleeting. Because 

 of the small sample sizes, data for the two fleeted plots were 

 pooled for this analysis. Each individual recaptured was either 

 alive or dead, and the shells were classified as either damaged or 

 undamaged. We also analyzed damage and mortality in all four 

 plots using chi-square tests of independence. 



For analysis of growth we employed a one-way ANOVA keeping 

 the four treatments separate (upstream control, downstream 

 control, pilings, and grounded barges). Variances were 



16 



