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    Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12348/1729

    Simulation of optimal harvesting strategies for small-scale mixed-sex tilapia (Oreochromis shiranus Boulenger 1896) ponds using a bio-economic model

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    Abstract
    • A cohort-based bio-economic biomass growth and economic model, validated with data from experiments conducted in Malawi, was used to identify an optimal harvesting strategy for mixed-sex tilapia ponds.Three harvesting scenarios (baseline, economic optimum time +10 days and economic optimum time) were used. In each harvesting scenario four options were explored: (i) no further harvest, harvest every (ii) 60 days, (iii) 90 days and (iv) 120 days after initial harvest. The lowest simulated yield (487 kg ha-1 year-1) was obtained when no partial harvesting was carried out and fish were harvested after 365 days. Maximum yield (4416 kg ha-1year-1) was obtained when partial harvests were carried out every 90 days starting with a first harvest of fish weighing 60 g or more at day 90. Maximum financial returns (US$2561 ha-1year-1) were obtained when partial harvests were carried out every 120 days starting with the first harvest at day 90 and removing all fish >= 60 g. The model simulations indicate that mixed-sex tilapia culture may be profitable for tilapia farmers in Africa where markets accept small (60-150 g)-sized fish. The study further shows that a cohort-based population growth model can be reliably incorporated in tilapia production models to simulate fish yields in mixed-sex tilapia production systems. However, incorporation of intergenerational competition e¡ects could improve the model’s utility as a decision support tool for managing mixed-sex tilapia production.
    • External link to download this item: https://doi.org/10.1111/j.1365-2109.2007.01671.x
    Collections
    • Sustainable aquaculture [1847]
    Date
    • 2007
    Author
    • Saiti, F.
    • Jamu, D.M.
    • Chisala, B.
    • Kambewa, P.
    AGROVOC Keywords
    • farmers; fishing methods; tilapia
    Type
    • Journal Article
    Publisher
    • Wiley-Blackwell Publishing Ltd
    Metadata
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