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

Newman, Stephen J., Wright, Ian W., Rome, Ben M., Mackie, Michael C., Lewis, Paul D., Buckworth, Rik C., Ballagh, Aaron C., Garrett, Rod N., Stapley, Jason, Broderick, Damien, Ovenden, Jennifer R. and Welch, David J. (2010). Stock structure of Grey Mackerel, Scomberomorus semifasciatus (Pisces: Scombridae) across northern Australia, based on otolith stable isotope chemistry. In: Proceedings of the 4th International Otolith Symposium. 4th International Otolith Symposium, Monterey, CA, U.S.A., (357-367). 24-28 August 2009. doi:10.1007/s10641-010-9668-z


Author Newman, Stephen J.
Wright, Ian W.
Rome, Ben M.
Mackie, Michael C.
Lewis, Paul D.
Buckworth, Rik C.
Ballagh, Aaron C.
Garrett, Rod N.
Stapley, Jason
Broderick, Damien
Ovenden, Jennifer R.
Welch, David J.
Title of paper Stock structure of Grey Mackerel, Scomberomorus semifasciatus (Pisces: Scombridae) across northern Australia, based on otolith stable isotope chemistry
Formatted title
Stock structure of Grey Mackerel, Scomberomorus semifasciatus (Pisces: Scombridae) across northern Australia, based on otolith stable isotope chemistry

Conference name 4th International Otolith Symposium
Conference location Monterey, CA, U.S.A.
Conference dates 24-28 August 2009
Proceedings title Proceedings of the 4th International Otolith Symposium   Check publisher's open access policy
Journal name Environmental Biology of Fishes   Check publisher's open access policy
Place of Publication Dordrecht, Netherlands
Publisher Springer Netherlands
Publication Year 2010
Year available 2010
Sub-type Fully published paper
DOI 10.1007/s10641-010-9668-z
Open Access Status DOI
ISSN 0378-1909
1573-5133
Volume 89
Issue 3-4
Start page 357
End page 367
Total pages 10
Language eng
Abstract/Summary 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.
Formatted Abstract/Summary
The stable isotopes of δ18O and δ13C 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 (∼ 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.
© Springer
Keyword Grey Mackerel
Scomberomorus semifasciatus
Otolith isotope chemistry
Stock structure
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Conference Paper
Sub-type: Fully published paper
Collection: School of Biological Sciences Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 15 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 15 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sun, 09 Jan 2011, 10:08:26 EST