Jones and Wells: Yield modeling for Pogomas cromis 
333 
Table 2 
Estimates of F 0 l and F MAX compared to F CUH from Beverton-Holt yield-per-recruit modeling for various levels of K, M, and t r . The 
symbol *** indicates that F MAX occurs at the highest values of F. F CUR(i) was calculated from the upper-bound estimate of Z (as 
F cu R (i)) = Z~M i ) and represents the upper-bound estimate of current F. 
K M 
t c 
n.i 
Fmax 
Fcur 
K 
M 
t c 
Fn 
Fmax 
Fcur 
0.105 0.02 
5 
0.03 
0.06 
0.10 
0.124 
0.02 
5 
0.05 
0.07 
0.10 
10 
0.05 
0.09 
10 
0.06 
0.11 
15 
0.06 
0.17 
15 
0.07 
0.23 
20 
0.07 
0.40 
20 
0.08 
25 
0.09 
*** 
25 
0.09 
*** 
0.04 
5 
0.06 
0.08 
0.08 
0.04 
5 
0.06 
0.10 
0.08 
10 
0.07 
0.17 
10 
0.07 
0.24 
15 
0.09 
0.51 
15 
0.09 
1.38 
20 
0.10 
*** 
20 
0.12 
25 
0.12 
*** 
25 
0.12 
0.06 
5 
0.07 
0.13 
0.06 
0.06 
5 
0.08 
0.15 
0.06 
10 
0.09 
0.31 
10 
0.10 
0.47 
15 
0.11 
*** 
15 
0.13 
20 
0.13 
*** 
20 
0.14 
25 
0.15 
25 
0.14 
0.08 
5 
0.09 
0.17 
0.04 
0.08 
5 
0.09 
0.21 
0.04 
10 
0.12 
0.61 
10 
0.14 
1.11 
15 
0.15 
15 
0.17 
20 
0.17 
20 
0.19 
25 
0.19 
25 
0.20 
0.10 
5 
0.11 
0.23 
0.02 
0.10 
5 
0.12 
0.28 
0.02 
10 
0.15 
1.51 
10 
0.18 
15 
0.19 
15 
0.20 
20 
0.22 
20 
0.23 
25 
0.25 
25 
0.27 
0.12 
5 
0.13 
0.30 
0.00 
0.12 
5 
0.14 
0.39 
0.00 
10 
0.19 
10 
0.20 
15 
0.23 
15 
0.25 
20 
0.27 
20 
0.29 
25 
0.311 
25 
0.30 
Table 3 
Lifetime cohort biomass ( g ) from the Ricker biomass model (Saila et al. 1988) under M=0. 02-0. 12, and uniform F=0-0.12. Integra- 
tion was by rectangular approximation. Simulations were based on an arbitrary starting biomass of 1000 g. 
F 
M 
0 
0.02 
0.04 
0.06 
0.08 
0.1 
0.12 
0.02 
180,730 
107,915 
70,195 
49,170 
36,595 
28,595 
23,210 
0.04 
107,915 
70,195 
49,170 
36,595 
28,595 
23,210 
19,420 
0.06 
70,195 
49,170 
36,595 
28,595 
23,210 
19,420 
16,675 
0.08 
49,170 
36,595 
28,595 
23,210 
19,420 
16,675 
14,600 
0.10 
36,595 
28,595 
23,210 
19,420 
16,675 
14,600 
13,040 
0.12 
28,595 
23,210 
19,420 
16,675 
14,600 
13,040 
11,750 
mated for northeast Florida (K= 0.124) which did include 
these ages. The values for L were virtually identical from 
both studies Model results based on this faster growth rate 
produced similarly shaped yield-per-recruit curves but 
with slightly higher yields and benchmark values (Fig. 4). 
At the most probable values of M (0.06; 0.08), yield-per- 
recruit curves peaked only at t c <10 yr. Otherwise, curves 
were asymptotic or rising. F MAX at t =5 yr was 0.15 for 
