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    • University of Missouri-Columbia
    • Graduate School - MU Theses and Dissertations (MU)
    • Theses and Dissertations (MU)
    • Theses (MU)
    • 2007 Theses (MU)
    • 2007 MU theses - Freely available online
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    Establishing mostly-male bluegill groups and evaluating their growth benefits in indoor rearing systems

    Doerhoff, Adam Jonathan
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    [PDF] public.pdf (4.107Kb)
    [PDF] short.pdf (9.063Kb)
    [PDF] research.pdf (489.9Kb)
    Date
    2007
    Format
    Thesis
    Metadata
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    Abstract
    Male bluegill have the greatest potential to reach food market size ([greater than or equal to] 0.5 lb.; 225g) within two growing seasons. However, establishment of monosex, juvenile bluegill groups does not currently exist. A male-percentage prediction (MPP) model was constructed to predict the percentage of males from a mixed-sex, juvenile bluegill group. The MPP model enables reliable establishment of mostly-male groups for culturing. Trenbolone acetate immersions provided a means of establishing these groups other than by size-grading. Sex reversal often yields aggressively feeding fish which ultimately grow faster. Where male recruitment was successful, many post-immersion males exhibited higher growth rates. After establishing mostly-male groups, the goal is to reduce the agonistic social costs of group confinement to promote growth to food market size in two years. Mixed-sex and mostly-male bluegill groups were cultured in parallel to evaluate the effect of sex ratio on growth. Mostly-male groups yielded higher growth rates, but not greater social costs.
    URI
    https://hdl.handle.net/10355/4915
    https://doi.org/10.32469/10355/4915
    Degree
    M.S.
    Thesis Department
    Fisheries and wildlife sciences (MU)
    Collections
    • Fisheries and Wildlife Sciences electronic theses and dissertations (MU)
    • 2007 MU theses - Freely available online

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