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Stock structure of blue threadfin Eleutheronema tetradactylum across northern Australia as inferred from stable isotopes in sagittal otolith carbonate
Citation
Newman, SJ and Pember, MB and Rome, BM and Mitsopoulos, GEA and Skepper, CL and Allsop, Q and Saunders, T and Ballagh, AC and van Herwerden, L and Garrett, RN and Gribble, NA and Stapley, M and Meeuwig, JJ and Moore, BR and Welch, DJ, Stock structure of blue threadfin Eleutheronema tetradactylum across northern Australia as inferred from stable isotopes in sagittal otolith carbonate, Fisheries Management and Ecology, 18, (3) pp. 246-257. ISSN 0969-997X (2011) [Refereed Article]
Copyright Statement
Copyright 2011 Blackwell Publishing Ltd.
DOI: doi:10.1111/j.1365-2400.2010.00780.x
Abstract
Stable isotopes of δ18O and δ13C in sagittal otolith carbonates were used to determine the stock structure of the polynemid Eleutheronema tetradactylum (Shaw) across tropical northern Australia, where this species is an important component of inshore commercial and recreational fisheries. Stable isotopes from the sagittal otolith carbonate of 470 fish from 11 discrete locations across western, northern and eastern Australia were sampled between 2007 and 2009. Analysis of these stable isotopes revealed different location-specific signatures, indicating strong population subdivision. The significant differences in the isotopic signatures of E. tetradactylum demonstrated that there is unlikely to be substantial movement of fish between these locations. The spatial separation of these populations indicates a complex fine spatial scale stock structure across northern Australia, with at least 11 stocks or management units present. The population subdivision of E. tetradactylum was evident along expansive stretches of open beach systems and within coastal embayments with no physical barriers such as headlands. These results indicate that optimal fisheries management will require a review of the current spatial arrangements, particularly the potential for localised depletion of stocks on small spatial scales.
Item Details
Item Type: | Refereed Article |
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Keywords: | connectivity, fisheries management, Polynemidae, population subdivision, stable isotope chemistry |
Research Division: | Agricultural, Veterinary and Food Sciences |
Research Group: | Fisheries sciences |
Research Field: | Fisheries management |
Objective Division: | Animal Production and Animal Primary Products |
Objective Group: | Fisheries - wild caught |
Objective Field: | Wild caught fin fish (excl. tuna) |
UTAS Author: | Moore, BR (Dr Bradley Moore) |
ID Code: | 121423 |
Year Published: | 2011 |
Web of Science® Times Cited: | 14 |
Deposited By: | Sustainable Marine Research Collaboration |
Deposited On: | 2017-09-28 |
Last Modified: | 2017-11-02 |
Downloads: | 0 |
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