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Surface bands on deepwater squalid dorsal-fin spines : an alternative method for ageing centroselachus crepidater

Irvine, Sarah, Stevens, John and Laurenson, Laurie 2006, Surface bands on deepwater squalid dorsal-fin spines : an alternative method for ageing centroselachus crepidater, Canadian journal of fisheries and aquatic sciences, vol. 63, no. 3, pp. 617-627.

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Title Surface bands on deepwater squalid dorsal-fin spines : an alternative method for ageing centroselachus crepidater
Formatted title Surface bands on deepwater squalid dorsal-fin spines: an alternative method for ageing Centroselachus crepidater
Author(s) Irvine, Sarah
Stevens, John
Laurenson, Laurie
Journal name Canadian journal of fisheries and aquatic sciences
Volume number 63
Issue number 3
Start page 617
End page 627
Publisher NRC Research Press
Place of publication Ottawa, Ont.
Publication date 2006
ISSN 0706-652X
1205-7533
Keyword(s) marine environment
centroscymnus
squalidae
Summary Bands on the external surface of the second dorsal-fin spine proved to be a novel method of estimating the age and growth of Centroselachus crepidater. Bands that followed the shape of the spine base were enhanced with an alizarin red derivative. Internal bands in spine cross sections were also examined. The number of both external and internal bands increased with animal size, although most spines had more external than internal bands. External bands were more reliable and were assumed to be annuli. The rate of band formation differed after five bands had been formed, and internal bands ceased forming after 30 years. Females to 54 years old and males to 34 years old were examined. Maturity occurred over a wide age range, with estimates of 20 years for females and 9 years for males. The youngest pregnant female was 27 years old. The Francis reparameterized von Bertalanffy growth model found similar growth for males and females, and the von Bertalanffy equations were Lt = 96.12(1 – e(–0.072(t+6.13))) for females and Lt = 73.22(1 – e(–0.141(t+2.99))) for males.

Notes Reproduced with the specific permission of the copyright owner.
Language eng
Field of Research 060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2006, NRC Canada
Persistent URL http://hdl.handle.net/10536/DRO/DU:30003844

Document type: Journal Article
Collections: School of Life and Environmental Sciences
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.