Note: OFV = objective function value
aconstants (not estimated)
baverage catchabilities (q) for 59 CPUE series
Table 10. Estimates of recent exploitation rates (proportion of vulnerable biomass taken by the fishery).
|
Year
|
Model 1
|
Model 2
|
Model 3
|
Model 4
|
|
|
|
|
|
|
Basin
|
2006
|
0.022
|
0.023
|
0.022
|
0.022
|
|
2007
|
0.009
|
0.010
|
0.010
|
0.009
|
|
2008
|
0.004
|
0.005
|
0.005
|
0.005
|
|
|
|
|
|
|
NF Gulf
|
2006
|
0.000
|
0.000
|
0.000
|
0.000
|
|
2007
|
0.002
|
0.002
|
0.002
|
0.002
|
|
2008
|
0.000
|
0.000
|
0.000
|
0.000
|
|
|
|
|
|
|
Shelf
|
2006
|
0.018
|
0.018
|
0.018
|
0.018
|
|
2007
|
0.008
|
0.009
|
0.008
|
0.008
|
|
2008
|
0.021
|
0.021
|
0.021
|
0.021
|
Table 11. Estimates of population size and total biomass (mt) obtained from four models fit to the porbeagle data. See text for model descriptions.
|
|
Model 1
|
Model 2
|
Model 3
|
Model 4
|
Differing assumptions:
|
|
 estimated
|
=2.0
|
=2.5
|
=3.2
|
|
|
|
|
|
|
1961
|
SSN
|
71,858
|
86,447
|
79,722
|
73,838
|
|
N
|
760,620
|
915,048
|
843,866
|
781,582
|
|
Biomass
|
41,744
|
50,219
|
46,312
|
42,894
|
|
|
|
|
|
|
1971
|
SSN
|
17,439
|
33,087
|
25,947
|
19,868
|
|
N
|
291,174
|
422,212
|
362,599
|
310,002
|
|
Biomass
|
11,958
|
19,541
|
16,048
|
13,013
|
|
|
|
|
|
|
1981
|
SSN
|
20,842
|
35,013
|
28,561
|
22,759
|
|
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