193
Table 3 Main parameters of the dynamics of fish populations
Age group
number
Growth
Weight
Natural
mortality
Spawning
period
Juveniles
Migration pattern
Origin of spatial
distribution
Price elasticity
parameter
Sole
11 (age
1–11)
VBGF:
a
= 4.9e-07
0.1 ICES
(2012)
February–June Juveniles quit
nurseries at
age 3
Assumed annual
redistribution in
February for
spawning
BTS survey,
July
−0.24 (2.8e-3)
Log–log
Linf
= 37.7
K
= 0.3
T0
= −0.84
b
= 3.79
Plaice
7 (age 1–7) VBGF:
a
= 3.46e-5
0.1 ICES
(2012)
December–
March
Juveniles quit
nurseries at
age 3
Dec.: to spawning
area
CGFS October;
Coull et al.
(1998)
−2.6e-6 (8.8e-8)
linear
Linf
= 71.65
b
= 2.45
Apr.: to coastal areas
K
= 0.23
T0
= −0.83
Red mullet
4 (age 1–4) VBGF:
a
= 3.28e-6
–
May–July
Juveniles quit
coastal areas
at age 1
CGFS October; −4.1e06 (8.4e-8)
semi-log
Linf
= 51.35
b
= 3.24
K
= 0.186
t0
= −1.21
Scallops (all
populations)
VBGF Antoine
(1979)
a
= 2.74
e
-7
0.1
July
Maturity at
age 2
na
COMOR survey
b
= 2.9
Scallops Baie de
Seine (coast)
5 (age 2–6) Linf
= 139.23
Month effect
only
K
= 0.569
T0
= 0.527
Scallops Baie de
Seine (out)
5 (age 2–6)
Linf
= 139
−4.1e-8 (2.7e-8)
linear
K
= 0.475
T0
= 0.494
Scallops Beachy
Head
4 (age 3–6) Linf
= 129
−3.1e-6 (1.0e-6)
linear
K
= 0.484
T0
= 0.648
(continued)
A Spatial Model of the Mixed Demersal Fisheries in the Eastern Channel