White Grunt M 30 



Yield Per Recruit in Weight 



FISHERY BULLETIN: VOL. 81. NO. 4 



10.0- 



90- 



80 



£ 70 



I- 

 CL 



O 60 



3 5.0 



CD 

 < 



uj 4.0 



O 



< 



30 



2 



100 



120 



_100 



120 140 



1.0- 



_L 



2 0.4 0.6 0.8 10 12 1.4 16 



FISHING MORTALITY (F) 

 FIGURE 6.— Yield per recruit in weight of white grunt where M = 0.30. 



160 



J L 



18 20 



White Grunt M=0.57 



Yield Per Recruit in Weight 



It is apparent that on a yield per recruit basis the 

 fishery response to an increase in F is a nonlinear de- 

 crease in catch per unit effort (CPUE). The CPUE 

 decreases most rapidly after F exceeds about 0.3 for 

 most species. Further, the range of recruitment ages 

 at which any given yield is available increases rapidly 

 as F decreases. 



STATUS OF THE FISHERY 



Despite slight differences in the periods when each 

 species was studied, reasonable generalizations can 

 be made about the state of reef fish stocks off North 

 Carolina and South Carolina in the mid to late 1970's. 



z 



UJ 



ee 

 u 



ul 



< 



Figure 7. — Yield per recruit in weight of white grunt 

 where M = 0.57. 



686 



