Biological vulnerability of two exploited sharks of the genus Deania (Centrophoridae)

Irvine, S. B., Daley, R.K., Graham, K. J. and Stevens, J. D. 2012, Biological vulnerability of two exploited sharks of the genus Deania (Centrophoridae), Journal of fish biology, vol. 80, no. 5, pp. 1181-1206.

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Title Biological vulnerability of two exploited sharks of the genus Deania (Centrophoridae)
Formatted title Biological vulnerability of two exploited sharks of the genus Deania (Centrophoridae)
Author(s) Irvine, S. B.
Daley, R.K.
Graham, K. J.
Stevens, J. D.
Journal name Journal of fish biology
Volume number 80
Issue number 5
Start page 1181
End page 1206
Total pages 26
Publisher Wiley-Blackwell Publishing
Place of publication Oxford, England
Publication date 2012
ISSN 0022-1112
1095-8649
Keyword(s) Brier shark
Deep-water dogfish
growth
Longsnout dogfish
reproduction
South-east Australia
Summary Life-history parameters of Deania calcea and Deania quadrispinosa suggested that their productivity was very low. Maturity (LT50) occurs at c. 80% of maximum observed total lengths (LT) for both species and sexes. A large proportion of mature females were neither pre-ovulatory nor pregnant, and the reproductive cycle included a distinct resting phase after pregnancy. For D. calcea, mean ovarian fecundity was 12 and maximum observed litter size was 10 (average of six); D. quadrispinosa averaged 17 pups per litter. Birth LT was 28-33 cm for D. calcea and 23-25 cm for D. quadrispinosa. The male and female reproductive cycles were aseasonal, and consequently, the length of the reproductive cycle could not be determined. Preliminary ageing data from dorsal-spine growth bands suggested that female D. calcea lived to 31-36 years and males to 24-32 years. The LT-at-age data using external bands on the spines showed maturity occurring at 15·5 years (males) and 21·5 years (females), whereas banding on the internal dentine indicated maturity at 10·5 and 17·5 years for males and females. Thus, a female lifetime of 31-36 years allowed for a maximum of 7 litters if a 2 year cycle is assumed or only five litters with a 3 year cycle, resulting in a lifetime fecundity of only 42 pups (2 year cycle) or even lower (3 year cycle).
Language eng
Field of Research 059999 Environmental Sciences not elsewhere classified
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, The Authors
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047091

Document type: Journal Article
Collection: School of Ecology and Environment
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