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Stock structure of blue threadfin Eleutheronema tetradactylum across northern Australia, as indicated by parasites

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The parasite fauna of the blue threadfin Eleutheronema tetradactylum, collected from 14 sites across northern Australia, was examined to evaluate the degree of movement and subsequent stock structure of the fish. Univariate and multivariate analysis of nine ‘permanent’ parasite species [the nematodes Anisakis (type I) and Terranova (type II), the cestodes Otobothrium australe, Pterobothrium pearsoni, Pterobothrium sp. A, Callitetrarhynchus gracilis, Parotobothrium balli and Nybelinia sp., and the acanthocephalan Pomphorhynchus sp.] demonstrated little similarity between sites, indicating limited mixing and therefore long-term separation of post-juvenile fish. As such, the effects of fishing are likely to be localized within the current administrative boundaries, implying little need for interstate co-operative management. Within each jurisdiction, management of E. tetradactylum populations, including the establishment of harvest strategies and fishery regulations, should be conducted in a way that recognizes the resident nature of the fish.
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Keywords: biological tags; fisheries management; stock structure

Document Type: Regular Paper

Affiliations: 1: Queensland Primary Industries and Fisheries, Department for Employment, Economic Development and Innovation, Northern Fisheries Centre, P. O. Box 5396, Cairns, QLD 4870, Australia 2: Northern Territory Fisheries, Department of Resources, P. O. Box 3000, Darwin, NT 0801, Australia 3: Western Australian Fisheries & Marine Research Laboratories, Department of Fisheries Government of Western Australia, P. O. Box 20, North Beach, WA 6920, Australia 4: Fishing & Fisheries Research Centre, School of Earth and Environmental Sciences, James Cook University, Townsville, QLD 4811, Australia 5: Marine Parasitology, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia

Publication date: 2011-03-01

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