Figure 10. — Photomicrograph showing the structure of the gill rakers and the increase in relative 

 size of the first left gill arch of young Atlantic menhaden. 



limb extend downward and lie over those on the 

 upper part of the lower limb (fig. 10). The 



number of rakers on the first left gill arch is 

 variable and a nonlinear function of length 



502 



U.S. FISH AND WILDLIFE SERVICE 



