YELLOW PERCH IN SAGINAW BAY 



373 



Table 7. — Age distribution of yellow perch in May or early Jane collections 

 [Percentages in parentheses. Asterisks indicate dominant age groups] 



1 Average number of annuli. 



2 Actually, less than 0.05. 



3 The unweighted mean and the weighted mean of the averages for the individual samples are the same. 



Table 8. — Age distribution of yellow perch on different dates in 1955 

 [Percentage in parentheses. Asterisks indicate dominant age groups] 



1 Average number of annuli. Unweighted mean of averages for individual samples is 4.2. 



Table 9. — Age distribution of yellow perch in Lake Michigan, Lake Erie, and Saginaw Bay 



[Sources of data: Lake Erie, Jobes (1952); southern Green Bay and northern Lake Michigan, Hile and Jobes (1942); Saginaw Bay 1929-30 samples, Hile and 

 Jobes (1941); Saginaw Bay 1943-55 samples, present study. Percentage in parentheses] 



1 Average number of annuli. 



1 Fish caught in commercial and experimental trap nets. 



3 Fish caught in fyke nets, pound nets, and 2H-inch-mesh gill nets. 



* Fish caught in 2H-inch-mesh gill nets. 



