Table 3.

Model parameters

Parameter	Symbol	Value	Unit	Equation	Source
Initial genetic coefficient of variation	CVG	0.06	–		1
Initial heritability	h2	0.2	–		1
PMRN width	w	20	cm	[4]	2
Lower limit of maturation probability for defining PMRN width	pl	0.25	–	[4]	3
Upper limit of maturation probability for defining PMRN width	pu	0.75	–	[4]	3
Exponent of allometric weight-length relationship	b1	3	–	[5]	4
Constant in allometric weight-length relationship	a1	0.01		[5]	4
Exponent of allometric relationship between resource-acquisition rate and weight	1 − b2	0.75	–	[5]	5
Weight of a single egg	We	4·10−4	g	[6]	6
Size-independent instantaneous natural mortality rate	m0	0.1	year−1		2
Constant in size-dependent mortality function	c1	2.5		[7]	2
Exponent of size-dependent mortality function	d2	0.75	–	[7]	7
Constant in foraging-mortality function	c2	0.005		[8]	2
Exponent of foraging-mortality function	d3	4.5	–	[8]	2
Steepness of fisheries selectivity curve	η	0.2	cm−1	[9]	8
Length at 50% fisheries selectivity	L50	85	cm	[9]	8
Strength of density dependence in growth	d1	0.25	–	[14]	2
Biomass at which D(t) = 1		1.75·108	kg	[14]	9
Stock-recruitment constant	α	1.877·10−6	–	[13]	10
Stock-recruitment constant	β	2.346·10−11	–	[13]	10

–, dimensionless parameters. Model parameters related to noise components are listed in Table 1.

Sources: (1) Within the range reported by Gjedrem (1983), Mousseau and Roff (1987), Houle (1992), and Carlson and Seamons (2008); (2) values chosen such that the life-history characteristics resemble those of Atlantic cod in its northern range (e.g., Rose and Driscoll 2002; Heino et al. 2002b; McIntyre and Hutchings 2003; Marshall et al. 2004; Olsen et al. 2004, 2005). (3) Definition of PMRN width based on quartiles. (4) Values obtained from http://www.fishbase.org. (5) Brown et al. (2004). (6) Set such that individual fecundity is in the range reported by Kjesbu et al. (1998). (7) Peterson and Wroblewski (1984); Brown et al. (2004). (8) Set to create a fisheries selectivity curve rising with reasonable steepness at lengths close to the length at maturation before harvesting. (9) Set iteratively in conjunction with stock-recruitment parameters. (10) Set to create a population of large yet computationally manageable size (ca. 220 000 individuals) in which recruitment is roughly one half of the asymptotic level α/β.