The life histories of endangered hammerhead sharks (Carcharhiniformes, Sphyrnidae) from the east coast of Australia

Harry, A. V., Macbeth, W. G., Gutteridge, A. N. and Simpfendorfer, C. A. (2011) The life histories of endangered hammerhead sharks (Carcharhiniformes, Sphyrnidae) from the east coast of Australia. Journal of Fish Biology, 78 7: 2026-2051. doi:10.1111/j.1095-8649.2011.02992.x

Author Harry, A. V.
Macbeth, W. G.
Gutteridge, A. N.
Simpfendorfer, C. A.
Title The life histories of endangered hammerhead sharks (Carcharhiniformes, Sphyrnidae) from the east coast of Australia
Journal name Journal of Fish Biology   Check publisher's open access policy
ISSN 0022-1112
Publication date 2011-06
Sub-type Article (original research)
DOI 10.1111/j.1095-8649.2011.02992.x
Volume 78
Issue 7
Start page 2026
End page 2051
Total pages 26
Place of publication Oxford, U.K.
Publisher Wiley-Blackwell Publishing
Collection year 2012
Language eng
Formatted abstract
The life histories of two globally endangered hammerhead sharks, Sphyrna lewini and Sphyrna mokarran, were examined using samples collected from a range of commercial fisheries operating along the east coast of Australia. The catch of S. lewini was heavily biased towards males, and there were significant differences in von Bertalanffy growth parameters (L and k) and maturity [stretched total length (LST) and age (A) at which 50% are mature, LST50 and A50] between those caught in the tropics (L = 2119 mm, k = 0.163, LST50 = 1471 mm, A50 = 5.7 years) and those caught in temperate waters (L = 3199 mm, k = 0.093, LST50 = 2043 mm, A50 = 8.9 years). The best-fit estimates for a three-parameter von Bertalanffy growth curve fit to both sexes were L = 3312 mm, L0 = 584 mm and k = 0.076. Males attained a maximum age of 21 years and grew to at least 2898 mm LST. The longevity, maximum length and maturity of females could not be estimated as mature animals could not be sourced from any fishery. Length at birth inferred from neonates with open umbilical scars was 465–563 mm LST. There was no significant difference in length and age at maturity of male and female S. mokarran, which reached 50% maturity at 2279 mm LST and 8.3 years. Sphyrna mokarran grew at a similar rate to S. lewini and the best-fit estimates for a two-parameter von Bertalanffy equation fit to length-at-age data for sexes combined with an assumed mean length-at-birth of 700 mm were L = 4027 mm and k = 0.079. Females attained a maximum age of 39.1 years and grew to at least 4391 mm LST. The oldest male S. mokarran was 31.7 years old and 3691 mm LST. Validation of annual growth-band deposition in S. mokarran was achieved through a mark, tag and recapture study.
Keyword Age and growth
Age validation
Western North-atlantic
Protective gill nets
Modeling fish growth
Scalloped hammerhead
Lewini Griffith
Validated age
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biological Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 15 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 02 Sep 2011, 11:19:12 EST by Gail Walter on behalf of School of Biological Sciences