characteristics make this species very sensitive to disturbances introduced by fishing
and confer a low level of resilience to exploitation.
Similar to the stock distribution information, there is relatively a few information
about the growth and reproduction of the Blackspot Seabream in the Strait of
Gibraltar. The parameters estimated on the growth model (von Bertalanffy growth
function) were obtained by Gil (2006), and the parameters of the length-weight were
reported by Gil (2006) and Czerwinski et al. (2008). Also, Gil (2006) analyzed and
determined the length-fecundity relationship and the most probable month and
spawn percentage (SP vector). Later, from the original database generated by Gil
(2006), Gutiérrez-Estrada et al. (2017) determined the length-size standard deviation
relationship and the length-male and length-female proportion relationship
(Table 19.3).
19.5 Environmental Information
Nowadays there is a relatively wide knowledge about the environmental conditions
in the Strait of Gibraltar which is available in different open databases. These
databases record real and modeled data including on air and sea temperature,
salinity, temperature flux, salt flux, current speed, chlorophyll a concentration,
atmospheric pressure, rainfall, and freshwater discharge.
Table 19.3 Biological parameters of the Pagellus bogaraveo live history experimentally obtained
for the Strait of Gibraltar population
Model, relationship
Parameters, values
Von Bertalanffy model*
L 1 , t 0 , k
58 cm, À1.1674 years, 0.169 year
À1
*
62 cm, À0.3400 years, 0.162 year
-1#
Length-weight relationship (cm-g)
a lw , b wl
0.0140, 3.0140*
0.0010, 3.2390§
Length-size standard deviation relationship (cm-cm)
a σ , b σ
0.8591, 0.3663{
Length-fecundity relationship (cm-number of eggs)
a lf , b lf
3Á10–7, 4.26*
Month and spawn percentage (SP vector)
January(%), February(%). . .
(10n, 30n + 1, 60n + 2,. . .,0n + 11)*
Length-male and female proportion relationship (cm)
f 0 , f 1 , f 2
390.48, 15.4290, 0.1524{
§ Czerwinski et al. 2008
{ Gutiérrez-Estrada et al. 2017
aGil (2006)
b
Gil et al. (2017) Combined data from the Spanish and Moroccan fleets
636
J. Gil-Herrera et al.
and confer a low level of resilience to exploitation.
Similar to the stock distribution information, there is relatively a few information
about the growth and reproduction of the Blackspot Seabream in the Strait of
Gibraltar. The parameters estimated on the growth model (von Bertalanffy growth
function) were obtained by Gil (2006), and the parameters of the length-weight were
reported by Gil (2006) and Czerwinski et al. (2008). Also, Gil (2006) analyzed and
determined the length-fecundity relationship and the most probable month and
spawn percentage (SP vector). Later, from the original database generated by Gil
(2006), Gutiérrez-Estrada et al. (2017) determined the length-size standard deviation
relationship and the length-male and length-female proportion relationship
(Table 19.3).
19.5 Environmental Information
Nowadays there is a relatively wide knowledge about the environmental conditions
in the Strait of Gibraltar which is available in different open databases. These
databases record real and modeled data including on air and sea temperature,
salinity, temperature flux, salt flux, current speed, chlorophyll a concentration,
atmospheric pressure, rainfall, and freshwater discharge.
Table 19.3 Biological parameters of the Pagellus bogaraveo live history experimentally obtained
for the Strait of Gibraltar population
Model, relationship
Parameters, values
Von Bertalanffy model*
L 1 , t 0 , k
58 cm, À1.1674 years, 0.169 year
À1
*
62 cm, À0.3400 years, 0.162 year
-1#
Length-weight relationship (cm-g)
a lw , b wl
0.0140, 3.0140*
0.0010, 3.2390§
Length-size standard deviation relationship (cm-cm)
a σ , b σ
0.8591, 0.3663{
Length-fecundity relationship (cm-number of eggs)
a lf , b lf
3Á10–7, 4.26*
Month and spawn percentage (SP vector)
January(%), February(%). . .
(10n, 30n + 1, 60n + 2,. . .,0n + 11)*
Length-male and female proportion relationship (cm)
f 0 , f 1 , f 2
390.48, 15.4290, 0.1524{
§ Czerwinski et al. 2008
{ Gutiérrez-Estrada et al. 2017
aGil (2006)
b
Gil et al. (2017) Combined data from the Spanish and Moroccan fleets
636
J. Gil-Herrera et al.