Life history of the common blacktip shark, Carcharhinus limbatus, from central eastern Australia and comparative demography of a cryptic shark complex

Harry, Alastair V., Butcher, Paul A., Macbeth, William G., Morgan, Jess A.T., Taylor, Stephen M., and Geraghty, Pascal T. (2019) Life history of the common blacktip shark, Carcharhinus limbatus, from central eastern Australia and comparative demography of a cryptic shark complex. Marine and Freshwater Research, 70 (6). pp. 834-848.

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Abstract

Common and Australian blacktip sharks (Carcharhinus limbatus and Carcharhinus tilstoni) occur sympatrically in Australia, where they are reported as a complex because of their morphological similarities. This study provides the first description of the life history of C. limbatus using samples from central eastern Australia, where C. tilstoni is rare. Females (68-267 cm total length (TL); n = 183) and males (65-255 cm TL; n = 292) both matured at 8.3 years and 200 cm TL, which exceeds the maximum length of C. tilstoni. Vertebral ageing revealed that female and male C. limbatus lived to 22 and 24 years respectively, exceeding known longevity in C. tilstoni. The mean (±s.d.) intrinsic rate of population increase calculated using a Euler-Lotka demographic method was 0.11 ± 0.02 year-1 for C. limbatus, compared with 0.17 ± 0.02 and 0.20 ± 0.03 year-1 for two C. tilstoni stocks. Despite their similar appearance, these species differed in both their biological productivity and susceptibility to fishing activities. Monitoring of relative abundance should be a priority given they are likely to have divergent responses to fishing.

Item ID: 62045
Item Type: Article (Research - C1)
ISSN: 1448-6059
Keywords: age and growth, Chondrichthyes, fisheries management, reproductive biology
Copyright Information: © 2019 CSIRO.
Date Deposited: 07 Apr 2020 03:56
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070405 Fish Physiology and Genetics @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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