Stock structure of Grey Mackerel, Scomberomorus semifasciatus (Pisces: Scombridae) across northern Australia, based on otolith stable isotope chemistry |
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Authors: | Stephen J Newman Ian W Wright Ben M Rome Michael C Mackie Paul D Lewis Rik C Buckworth Aaron C Ballagh Rod N Garrett Jason Stapley Damien Broderick Jennifer R Ovenden David J Welch |
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Institution: | 1. Western Australian Fisheries and Marine Research Laboratories, Department of Fisheries, Government of Western Australia, North Beach, WA, 6920, Australia 2. Department of Regional Development, Primary Industries, Fisheries and Resources, G.P.O. Box?3000, Darwin, Northern Territory, 0801, Australia 3. Fishing and Fisheries Research Centre, School of Earth and Environmental Sciences, James Cook University, Townsville, Queensland, 4811, Australia 4. Northern Fisheries Centre, Queensland Department of Primary Industries and Fisheries, Cairns, QLD, 4870, Australia 5. Queensland Department of Primary Industries and Fisheries, Floor 6, North Tower, Queensland Biosciences Precinct, University of Queensland, St Lucia, QLD, 4072, Australia
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Abstract: | 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. |
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