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    Contrasting life history characteristics of the eightbar grouper Hyporthodus octofasciatus (Pisces: Epinephelidae) over a large latitudinal range reveals spawning omission at higher latitudes

    Access Status
    Fulltext not available
    Authors
    Wakefield, Corey
    Newman, Stephen
    Marriott, R.
    Boddington, D.
    Fairclough, D.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Wakefield, C. and Newman, S. and Marriott, R. and Boddington, D. and Fairclough, D. 2013. Contrasting life history characteristics of the eightbar grouper Hyporthodus octofasciatus (Pisces: Epinephelidae) over a large latitudinal range reveals spawning omission at higher latitudes. ICES Journal of Marine Science. 70 (3): pp. 485-497.
    Source Title
    ICES Journal of Marine Science
    Additional URLs
    http://icesjms.oxfordjournals.org/content/70/3/485
    ISSN
    10543139
    URI
    http://hdl.handle.net/20.500.11937/31916
    Collection
    • Curtin Research Publications
    Abstract

    Demographic data on deep-water groupers are limited despite them being highly exploited throughout the Indo-Pacific. In Western Australia, the continuous distribution of the eightbar grouper, Hyporthodus octofasciatus, spans tropical to temperate waters over 3500 km from 128S–358S. The maximum age was markedly higher in the northern tropical waters than in southern temperate waters, i.e. 47 vs 20 years. Females attained a significantly larger length-at-age in southern temperate waters. Macroscopic and microscopic, examination of gonads and annual trends in mean monthly gonadosomatic indices (GSIs) were used to determine that this monandric protogynous hermaphrodite spawns from late spring to summer (October–February) in northwestern Australia. In the temperate waters of WA, there was no evidence of reproduction and no males were observed south of 308S latitude. The lengths at which 50% of female H. octofasciatus matured and changed sex were estimated from northern tropical populations at 560 mm (6.1 years) and 1022 mm (=11 years). Although the population connectivity of H. octofasciatus is unknown, the spawning omission in temperate waters suggests recruitment from the northern tropical areas and highlights the importance of preserving spawning stocks in those northern waters.

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