334 
Fishery Bulletin 99(2) 
F 
0.00 
0.02 
— — 0.04 
0.06 
0.08 
Figure 3 
Ricker biomass curves under conditions of high instanta- 
neous fishing mortality, F= 2.0, in the first 5 years with low, 
uniform F=0. 0-0.1 thereafter and M=0.06-0.10. The dash- 
dot-dot-dash ( — ) and dash-dot-dash ( — — ) lines rep- 
resent the most likely range of current fishing mortality, 
Fcur = ® .04 and 0.06, respectively. Note that recruit biomass 
is arbitrarily set at 1000 g. 
Table 4 
Lifetime cohort biomass (g) from the Ricker biomass model (Saila et al. 1988) under M=0.02-0.12, and F=‘2.0 over the first 5 years 
and low uniform F=0-0 . 12 thereafter. Integration 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 
20,395 
15,785 
13,075 
11,390 
10,270 
9495 
0.04 
107,915 
14,750 
12,305 
10,775 
9760 
9055 
8560 
0.06 
70,195 
11,610 
10,225 
9315 
8675 
8225 
7875 
0.08 
49,170 
9730 
8895 
8325 
7910 
7600 
7370 
0.10 
36,595 
8525 
8000 
7630 
7360 
7145 
6990 
0.12 
28,595 
7730 
7380 
7130 
6940 
6785 
6660 
M= 0.06 and 0.21 for M=0.08 (Table 2), greater than our 
estimate of Z and F CUR . At t c >10, F MAX occurred at the 
highest levels of F. At the most probable levels of M, F 0 x 
was greater than F CUR (Table 2). Hence under either F MAX 
or F 0 : and larger K , F CUR was still below that needed to 
obtain maximum yields from the fishery in Chesapeake 
Bay. 
Similarly, model results from this faster growth <K=0. 124 ) 
and broader levels of M (0.02-0.12) showed that F CUR 
is below F MAX and F 0 j for Bay region fisheries except 
