42 
Fishery Bulletin 95(1], 1997 
Age (yr) 
Figure 4 
Selectivity schedule used in the simulation. The fishing mortality rate is the prod- 
uct of the maximum fishing mortality rate ( F ) and the selectivity value correspond- 
ing to fish age. 
Total length (cm) 
Figure 5 
Observed and simulated length frequencies of red snapper harvested in 1993. 
