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Stock structure of Grey Mackerel, Scomberomorus semifasciatus (Pisces: Scombridae) across northern Australia, based on otolith stable isotope chemistry

Newman, S.J. and Wright, I.W. and Rome, B.M. and Mackie, M.C. and Lewis, P.D. and Buckworth, R.C. and Ballagh, A.C. and Garrett, R.N. and Stapley, J. and Broderick, D. and Ovenden, J.R. and Welch, D.J. (2010) Stock structure of Grey Mackerel, Scomberomorus semifasciatus (Pisces: Scombridae) across northern Australia, based on otolith stable isotope chemistry. Environmental Biology of Fishes, 89 (3-4). pp. 357-367.

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Article Link(s): http://dx.doi.org/10.1007/s10641-010-9668-z

Publisher URL: http://www.springeronline.com

Abstract

The stable isotopes of delta O-18 and delta C-13 in sagittal otolith carbonates were used to determine the stock structure of Grey Mackerel, Scomberomorus semifasciatus. Otoliths were collected from Grey Mackerel at ten locations representing much of their distributional and fisheries range across northern Australia from 2005 to 2007. Across this broad range (similar to 6500 km), fish from four broad locations-Western Australia (S1), Northern Territory and Gulf of Carpentaria (S2, S3, S4, S5, S6, S7), Queensland east coast mid and north sites (S8, S9) and Queensland east coast south site (S10)-had stable isotope values that were significantly different indicating stock separation. Otolith stable isotopes differed more between locations than among years within a location, indicating temporal stability across years. The spatial separation of these populations indicates a complex stock structure across northern Australia. Stocks of S. semifasciatus appear to be associated with large coastal embayments. These results indicate that optimal fisheries management may require a review of the current spatial arrangements, particularly in relation to the evidence of shared stocks in the Gulf of Carpentaria. Furthermore, as the population of S. semifasciatus in Western Australia exhibited high spatial separation from those at all the other locations examined, further research activities should focus on investigating additional locations within Western Australia for an enhanced determination of stock delineation. From the issue entitled "Proceedings of the 4th International Otolith Symposium, 24-28 August 2009, Monterey, California"

Item Type:Article
Additional Information:© Springer Science+Business Media B.V.
Keywords:Grey mackerel; Scomberomorus semifasciatus; otolith isotope chemistry; stock structure; east coast waters; fisheries management; western Australia; ratio analysis; fish otoliths; S. munroi; S. queenslandicus; spotted mackerel; school mackerel.
Subjects:Aquaculture and Fisheries > Fisheries > By region or country > Australia
Science > Zoology > Chordates. Vertebrates > Fishes
Deposited On:28 Feb 2011 05:27
Last Modified:15 Jun 2011 03:17

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