Stock structure of blue threadfin Eleutheronema tetradactylum across northern Australia as inferred from stable isotopes in sagittal otolith carbonate

Newman, S.J., Pember, M.B., Rome, B.M., Mitsopoulos, G.E.A., Skepper, C.L., Allsop, Q., Saunders, T., Ballagh, A.C., van Herwerden, L., Garrett, R.N., Gribble, N.A., Stapley, J.M., Meeuwig, J.J., Moore, B.R., and Welch, D.J. (2011) 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.

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Abstract

Stable isotopes of ō18O and ō13C 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 ID: 17389
Item Type: Article (Refereed Research - C1)
Keywords: connectivity, fisheries management, Polynemidae, population subdivision, stable isotope chemistry
ISSN: 1365-2400
Funders: Fisheries Research and Development Corporation
Projects and Grants: FRDC Project No. 2007/032
Date Deposited: 29 Jun 2011 04:56
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070403 Fisheries Management @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830204 Wild Caught Fin Fish (excl. Tuna) @ 100%
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