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dc.creatorSaiti, F.
dc.creatorJamu, D.M.
dc.creatorChisala, B.
dc.creatorKambewa, P.
dc.date.accessioned2018-11-06T10:28:49Z
dc.date.available2018-11-06T10:28:49Z
dc.date.issued2007
dc.identifierhttp://onlinelibrary.wiley.com/doi/10.1111/j.1365-2109.2007.01671.x/abstract
dc.identifier.citationAquaculture research 38:340-350
dc.identifier.issn1355-557X
dc.identifier.urihttps://hdl.handle.net/20.500.12348/1729
dc.description.abstractA 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.
dc.formatapplication/pdf
dc.languageEn
dc.publisherWiley-Blackwell Publishing Ltd
dc.sourceAquaculture Research
dc.titleSimulation of optimal harvesting strategies for small-scale mixed-sex tilapia (Oreochromis shiranus Boulenger 1896) ponds using a bio-economic model
dc.typeJournal Article
dcterms.bibliographicCitationSaiti, F. et al. (2007). Simulation of optimal harvesting strategies for small-scale mixed-sex tilapia (Oreochromis shiranus Boulenger 1896) ponds using a bio-economic model. Aquaculture research 38:340-350
dc.description.versionPeer Review
cg.coverage.countryMalawi
cg.coverage.regionAfrica
cg.identifier.worldfish943
cg.subject.agrovocfarmers
cg.subject.agrovocfishing methods
cg.subject.agrovoctilapia
cg.subject.worldfishfish harvesting
cg.identifier.statusLimited access
cg.identifier.ISIindexedISI indexed
cg.contribution.worldfishauthorJamu, D.M.
cg.description.themeSustainable aquaculture
dc.identifier.doihttps://doi.org/10.1111/j.1365-2109.2007.01671.xen_US
cg.identifier.urlhttps://doi.org/10.1111/j.1365-2109.2007.01671.x


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