Towards better management of Australia’s shark fishery: genetic analyses reveal unexpected ratios of cryptic blacktip species Carcharhinus tilstoni and C. limbatus

J. R. Ovenden; J. A. T. Morgan; T. Kashiwagi; D. Broderick; J. Salini

doi:10.1071/mf09151

journal article Feb 25, 2010

Towards better management of Australia’s shark fishery: genetic analyses reveal unexpected ratios of cryptic blacktip species Carcharhinus tilstoni and C. limbatus

J. R. Ovenden J. A. T. Morgan T. Kashiwagi D. Broderick J. Salini

Marine and Freshwater Research Vol. 61 No. 2 pp. 253-262 · CSIRO Publishing

View at Publisher Save 10.1071/mf09151

Abstract

The common blacktip shark (Carcharhinus limbatus) and the Australian blacktip shark (C. tilstoni) are morphologically similar species that co-occur in subtropical and tropical Australia. In striking contrast to what has been previously reported, we demonstrate that the common blacktip shark is not rare in northern Australia but occurs in approximately equal frequencies with the Australian blacktip shark. Management of shark resources in northern Australia needs to take account of this new information. Species identification was performed using nucleotide sequences of the control, NADH dehydrogenase subunit 4 (ND4) and cytochrome oxidase I (COI) regions in the mitochondrial genome. The proportion of overall genetic variation (FST) between the two species was small (0.042, P &lt; 0.01) based on allele frequencies at five microsatellite loci. We confirm that a third blacktip species (C. amblyrhynchoides, graceful shark) is closely related to C. tilstoni and C. limbatus and can be distinguished from them on the basis of mtDNA sequences from two gene regions. The Australian blacktip shark (C. tilstoni) was not encountered among 20 samples from central Indonesia that were later confirmed to be common blacktip and graceful sharks. Fisheries regulators urgently need new information on life history, population structure and morphological characters for species identification of blacktip shark species in Australia.

Topics

No keywords indexed for this article. Browse by subject →

References

32

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

[13]

[14]

[15]

[16]

[17]

[18]

[19]

[20]

[21]

[22]

[23]

[24]

[25]

[26]

[27]

[28]

[29]

[30]

[31]

[32]

Metrics

44

Citations

32

References

Details

Published: Feb 25, 2010
Vol/Issue: 61(2)
Pages: 253-262
License: View

Authors

J

J. R. Ovenden

AMolecular Fisheries Laboratory, Queensland Primary Industries and Fisheries, PO Box 6097, St Lucia, QLD 4069, Australia.; CCorresponding author. Email: jennifer.ovenden@dpi.qld.gov.au

J

J. A. T. Morgan

AMolecular Fisheries Laboratory, Queensland Primary Industries and Fisheries, PO Box 6097, St Lucia, QLD 4069, Australia.

T

T. Kashiwagi

AMolecular Fisheries Laboratory, Queensland Primary Industries and Fisheries, PO Box 6097, St Lucia, QLD 4069, Australia.

D

D. Broderick

AMolecular Fisheries Laboratory, Queensland Primary Industries and Fisheries, PO Box 6097, St Lucia, QLD 4069, Australia.

J

J. Salini

BCSIRO Marine Laboratories, Cleveland, QLD 4163, Australia.

Cite This Article

J. R. Ovenden, J. A. T. Morgan, T. Kashiwagi, et al. (2010). Towards better management of Australia’s shark fishery: genetic analyses reveal unexpected ratios of cryptic blacktip species Carcharhinus tilstoni and C. limbatus. Marine and Freshwater Research, 61(2), 253-262. https://doi.org/10.1071/mf09151

Towards better management of Australia’s shark fishery: genetic analyses reveal unexpected ratios of cryptic blacktip species Carcharhinus tilstoni and C. limbatus

You May Also Like