FISHERY BULLETIN: VOL. 87, NO. 1 



Table 4. — Estimates of virgin levels of recruitment, adult population density, and biomass; recommended levels of fishing mortality, biomass, 

 and yield; and 1987 biomass. Estimates were obtained from commercial CPUE data, using tvi/o sets of selectivity (LSOs^,) parameters, 

 four levels of natural mortality (M), and two assumptions about the stock-recruitment relationship (A = 0.889 - recruitment dependent 

 on spawning stock, A = 1 .000 - recruitment constant). 



Female/male selectivity parameter LSOj^, 



M: 



Virgin recruitment level (thousands) 

 Virgin population density (#/km^) 

 Virgin biomass (t) 

 Recommended F (A = 0.889) 

 Recommended F (A = 1 .000) 

 Recommended biomass (t) (A = 0.889) 

 Recommended biomass (t) (A = 1 .000) 

 Recommended yield (t) (A = 0.889) 

 Recommended yield (t) (A = 1.000) 

 Estimated 1987 biomass (t) 



c 



o 



30 50 70 90 110 1 30 1 50 170 1 90 





o 

 O 



30 50 70 90 110 130 150 170 190 



Virgin recruitment (thousands) 



Figure 2.— Correlation between fishing mortality rates in the 

 simulated fishery and estimates of fishing effort from commercial 

 (1980-82) and research (1982-85) CPUE data, at natural mortal- 

 ity rates of 0.10-0.25 and virgin recruitment levels of 30,000- 

 200,000 age-6 tilefish. Recruitment levels without correlation coef- 

 ficients were inadequate to sustain the observed catches. Results 

 for the alternative set of selectivity parameters (L50^,,) were 

 similar and are not shown here. 



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