dc.contributor.author |
Bishop, Silver |
en |
dc.contributor.author |
Francis, MP |
en |
dc.contributor.author |
Duffy, C |
en |
dc.contributor.author |
Montgomery, John |
en |
dc.date.accessioned |
2015-01-21T18:56:46Z |
en |
dc.date.issued |
2006-01-02 |
en |
dc.identifier.citation |
Marine and Freshwater Research, 2006, 57 (2), pp. 143 - 154 |
en |
dc.identifier.issn |
1323-1650 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/24206 |
en |
dc.description.abstract |
Shortfin mako sharks were aged by counting growth bands in sectioned vertebrae (n = 256), and assuming annual band-pair deposition. No systematic ageing bias was present and count precision was high. 0+ juveniles were identified from length–frequency plots and assigned ages based on a theoretical birth date of 1 October and their date of capture. A Schnute generalised growth model fitted to the combined vertebral and 0+ data described the growth patterns best. Shortfin makos grow very rapidly initially, increasing by ~39 cm fork length in their first year. Thereafter, males and females grow at similar but slower rates until about age 7 years, after which the relative growth of males declines. Longevity estimates were 29 and 28 years for males and females respectively. Natural mortality (M) is probably in the range of 0.10–0.15. Median ages at maturity were 7–9 years for males and 19–21 years for females. Comparisons of growth curves reported here and elsewhere suggest no regional differences in growth rates. The shortfin mako is a late-maturing species with moderate longevity and low natural mortality. With these life history characteristics and an unknown stock size and structure worldwide, management should be of a precautionary nature. Keywords: ageing, conservation, fisheries management, vertebrae. |
en |
dc.language |
EN |
en |
dc.publisher |
CSIRO Publishing |
en |
dc.relation.ispartofseries |
Marine and Freshwater Research |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/1323-1650/ |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.subject |
ageing |
en |
dc.subject |
conservation |
en |
dc.subject |
fisheries management |
en |
dc.subject |
vertebrae |
en |
dc.subject |
GULF-OF-MEXICO |
en |
dc.subject |
PELAGIC SHARKS |
en |
dc.subject |
VALIDATED AGE |
en |
dc.subject |
LIFE-HISTORY |
en |
dc.subject |
SOUTH-AFRICA |
en |
dc.subject |
LAMNA-NASUS |
en |
dc.subject |
BIOLOGY |
en |
dc.subject |
RAFINESQUE |
en |
dc.subject |
PRECISION |
en |
dc.subject |
FISHERY |
en |
dc.title |
Age, growth, maturity, longevity and natural mortality of the shortfin mako shark (Isurus oxyrinchus) in New Zealand waters |
en |
dc.type |
Journal Article |
en |
dc.identifier.doi |
10.1071/MF05077 |
en |
pubs.issue |
2 |
en |
pubs.begin-page |
143 |
en |
pubs.volume |
57 |
en |
dc.rights.holder |
Copyright: CSIRO Publishing |
en |
pubs.end-page |
154 |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
en |
pubs.subtype |
Article |
en |
pubs.elements-id |
111618 |
en |
pubs.org-id |
Science |
en |
pubs.org-id |
Marine Science |
en |
dc.identifier.eissn |
1448-6059 |
en |
pubs.record-created-at-source-date |
2015-01-22 |
en |