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The constants A and B for each species and site are found by regression and are shown in 

 Table V. These constants and equation (1) are then used to calculate a reference mercury 

 concentration for each species and site for a chosen reference fish length. The reference fish 

 lengths for walleye and northern pike are 39 cm and 55 cm, respectively, based on several 

 considerations (Sorensen et ai, 1990). For other species, the median lengths given in Table 

 IIIA are used as the reference lengths. 



Table V. Site and Species Specific Summary of Statistical Analyses of Mercury in Fish 



"Correlations are for log-transformed variables. 



''Ages were not determined for all fish; a t indicates insufficient data for the age-Hg cone, correlation. Other 



age entries are derived firom the same number of data points as weight and length entries except for 



smallmouth bass sites 1654 and 1777 where n (for age) are both nine. 

 •^Regression equation is: Hg conc(ppb) = A x length(cm)B. 

 •^Reference mercury concentrations are calculated using the regression equation for the following fish 



lengths: 55 cm northern pike and 39 cm walleye (Sorensen et al., 1990) and median lengths (Table IV) for 



other species. 



12 



