Age, growth, maturity, longevity and natural mortality of the shortfin mako shark (Isurus oxyrinchus) in New Zealand waters
S. D. H. Bishop A D , M. P. Francis B , C. Duffy C and J. C. Montgomery A
A School of Biological Sciences and Institute of Aquatic and Atmospheric Sciences, Private Bag 92019, The University of Auckland, Auckland, New Zealand.
B National Institute of Water and Atmospheric Research Ltd, Private Bag 14-901, Kilbirnie, Wellington, New Zealand.
C Department of Conservation, Private Bag 68908, Newton, Auckland, New Zealand.
D Corresponding author. Email: email@example.com
Marine and Freshwater Research 57(2) 143-154 http://dx.doi.org/10.1071/MF05077
Submitted: 19 April 2005 Accepted: 3 November 2005 Published: 2 February 2006
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.
Extra keywords: ageing, conservation, fisheries management, vertebrae.
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