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    A multifaceted approach to modelling growth of the Australian bonito, Sarda australis (Family Scombridae), with some observations on its reproductive biology

    Access Status
    Fulltext not available
    Authors
    Stewart, J.
    Robbins, William
    Rowling, K.
    Hegarty, A.
    Gould, A.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Stewart, J. and Robbins, W. and Rowling, K. and Hegarty, A. and Gould, A. 2013. A multifaceted approach to modelling growth of the Australian bonito, Sarda australis (Family Scombridae), with some observations on its reproductive biology. Marine and Freshwater Research. 64 (7): pp. 671-678.
    Source Title
    Marine and Freshwater Research
    DOI
    10.1071/MF12249
    ISSN
    1323-1650
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/52070
    Collection
    • Curtin Research Publications
    Abstract

    Growth of the Australian bonito, Sarda australis, is described for the first time using data from three different sources. Von Bertalanffy growth functions were fitted to: (1) size-at-age data derived from sectioned sagittal otoliths, (2) monthly length-frequency collections from a commercial line fishery, and (3) tag-recapture data from a long-term cooperative tagging study. Age estimates of S. australis were indirectly validated by examining the percentage of otoliths with opaque edges each month. The best-fitting growth functions for each data source yielded similar results, showing strong seasonal variations in growth rate. Maximum growth occurred during summer, with near cessation of growth apparent during winter. Early growth was very fast, with fish attaining ~30cm fork length (FL) after 3-4 months. Growth of males and females was not significantly different. The oldest fish sampled was estimated to be 3+ years old, while the largest fish aged was 63.8cm FL. Gonadosomatic indices indicated that S. australis has an austral spring/summer spawning period in eastern Australia. A preliminary estimate of the size at first sexual maturity was ~36cm FL for both males and females, corresponding to an age of ~1 year. Journal compilation © CSIRO 2013.

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