Kyne & Simpfendorfer.. - Shark Specialist Group

Table 2.4. Age and growth of centrophorid sharks. von Bertalanffy growth model (VBGM)
parameters: L ∞ (mm TL), k (year -1 ), t 0 (years); t max oldest fish (years), A mat age at maturity
(years). Band count method: Int DS, internal dorsal spine band count; Ext DS, external dorsal
spine band count; RadioM, radiometric ageing.
Species Location Method
VBGM parameters
L ∞ k t 0
t max A mat Reference
Centrophorus
acus
Suruga Bay, Japan, NW
Pacific
Int DS ♀ 1262
♂ 1172
0.155
0.173
-0.485
-1.403
18
17
--
10
Tanaka (1990)
Centrophorus
granulosus
Western Mediterranean Int DS ♀ 1094
♂ 917
0.096
0.107
-5.48
-9.78
39
25
16.5
8.5
Guallart (1998)
Centrophorus
squamosus
Rockall Trough and
Porcupine Bank, NE
Atlantic
Int DS ♀ --
♂ --
--
--
--
--
70
71
35
30
Clarke et al. (2002a)
Centrophorus
cf. uyato
Australia RadioM ♀ + ♂ -- -- 46* -- Fenton (2001)
Deania calcea
Rockall Trough and
Porcupine Bank, NE
Atlantic
Int DS ♀ 1193
♂ 935
0.077
0.135
-0.933
-0.165
35
32
25
--
Clarke et al. (2002b)
SE Australia Ext DS ♀ 1225
♂ --
0.051
--
-5.11
--
37
33
21.5
13.5
Irvine (2004)
*No mature specimens were aged.
Family Etmopteridae. Lanternsharks.
The lanternsharks are the most diverse family of squaloid sharks, with 47 species, all of which
inhabit deepwater. Endemism is high in this family; many have restricted ranges, while others
are more wide-ranging and global in their distribution. The vast majority of species are
poorly-known, particularly the more localised species. For example, the smalleye lanternshark
Etmopterus litvinovi has only been recorded from two isolated ridges in the Southeast Pacific
while the rare cylindrical lanternshark E. carteri has only ever been located from a small area
and narrow depth range on the upper slope off the Caribbean coast of Colombia. A group of 6
Australian and New Caledonian Etmopterus spp are known only from their original
description (Last, Burgess and Séret 2002), a situation not uncommon amongst the deepwater
squaloids. The biology of these species and many other etmopterids is virtually unknown.
Reproductive and age and growth parameters for etmopterid sharks are summarized in Tables
2.5 and 2.6, respectively.
While there is biological information for two species of Centroscyllium and several
Etmopterus, primarily from studies conducted in the NE Atlantic and southern Australia, the
sole members of the three other etmopterid genera (Aculeola, Miroscyllium and
Trigonognathus) are very poorly-known. Acuña et al. (2003) reports an average litter size of
10 in the hooktooth dogfish Aculeola nigra from off Chile and Yano et al. (2003) noted that
litter size in the viper dogfish Trigonognathus kabeyai from southern Japan is likely to be