English

34
GFCM:SAC13/2011/Dma2
Samples of Prionace glauca come from Aegean Sea, the Ionian Sea, the Adriatic Sea and the
Levantine basin.
Age and growth data presented in this Section include parameters for the von Bertalanffy
growth model (VBGM) (von Bertalanffy 1938) which provides estimates of L∞, the
asymptotic or maximum length (or width for some batoids), k, the growth coefficient, and t0,
the age or time when length theoretically equals zero (tabl. 5).
Table 5: Von Bertalanffy growth model (VBGM) parameters: L∞ (mm TL), k (year -1 ), t0
(years); tmax oldest fish (years), Amat age at maturity (years). Band count method: Vert,
vertebral band count; Ext DS, external dorsal spine band count; Int DS, internal dorsal spine
band count. GSAs: the number refers to GFCM geographical sub-areas.
Species GSAs Methods Sex
VBGM parameters
L∞ (mm) K t0
Centrophorus granulosus 6 Int. DS
M
F
917
1094
0.107
0.096
-9.78
-5.48
25
39
8.5
16.5
Etmopterus spinax
Squalus blainvillei
Squalus acanthias
Prionace glauca
Dasyatis pastinaca
Rhinobatos rhinobatos
10
Vert.
M 394.3 0.19 -1.41 8
F 450 0.16 -1.09 10
tmax Amat Reference
Guallart (1998)
Gennari E &
Scacco U.
(2007)
19/20 Vert. M+F 7 5 Sion et al. (2002)
16 Vert.
M 960 0.135 -1.397 8 3.3
F 1179 0.102 -1.380 8 5.1
14 Int. DS M 91.1 0.14 -1.42 15 4.79
29 Ext DS
29 Int. DS
18,19,
20,
21;22,
23,24
24 Vert.
24 Vert.
F 105.7 0.11 -1.12 19 7.44
M 1245 0.171 -2.62 27
F 1405 0.141 -2.69 38
M 1280 0.20 -0.3 13
F 1450 0.17 -0.7 14
M 4.9
Vert. F 402 0.13 -0.62 12
M 203.13 0.039 -2.00 8
F 219.85 0.041 -2.61 12
M+F 294.94 0.029 -2.20
5.5
Cannizzaro et al.
(1995)
Marouani et al.
2010
Demirhan &
Seyhan (2007)
Avsar (2001)
Megalofonou et
al. (2005, 2009)
Yeldan et al.
(2008)
M+F 121.5 0.089 -1.615 10 Ismen. (2003)
M 121.65 0.310 -0.131 15
F 154.88 0.134 -1.264 24
Başusta et al.
(2008)