LIFE HISTORY OF LAKE HERRING OF LAKE HURON 



357 



Table 31. — Actual average, minimum, and maximum length and weight for each age group of a year 



class attained by the Saginaw Bay herring 



1 Tobico and Nayanquing samples combined. 

 - Gravelly Point herring. 



3 1, 2, and 4 combined. 

 * Au Ores herring. 



As shown in Table 31, the smallest 2-year herring measured 177 millimeters in 

 length; the hghtest 2-year fish weighed 2 ounces. The largest 2-year herring 

 measured 229 millimeters in length; the heaviest weighed 5 ounces. The smallest 

 sexually mature male measured 160 millimeters in length; the smallest sexually 

 mature female 190 millimeters. The youngest se.xually mature male and female 

 were in their second year. The largest sexually mature male was in its eighth year 

 and measured 365 millimeters in length. The largest sexually mature female meas- 

 ured 335 millimeters in length and was in its sixth year (Table 32). The largest 

 sexually immature or nonspawning male was 238 millimeters long; the oldest was 

 in its fifth year. The largest sexually immature or nonspawning female was 257 

 millimeters long; the oldest was in its fifth year. The heaviest male weighed 16.5 

 ounces, the heaviest female 13.0 ounces. The oldest male and female were in their 



