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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
dc.creator | Saiti, F. | |
dc.creator | Jamu, D. | |
dc.creator | Chisala, B. | |
dc.creator | Kambewa, P. | |
dc.date.accessioned | 2018-11-06T10:28:49Z | |
dc.date.available | 2018-11-06T10:28:49Z | |
dc.date.issued | 2007 | |
dc.identifier | http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2109.2007.01671.x/abstract | |
dc.identifier.citation | Aquaculture research 38:340-350 | |
dc.identifier.issn | 1355-557X | |
dc.identifier.uri | https://hdl.handle.net/20.500.12348/1729 | |
dc.description.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. | |
dc.format | application/pdf | |
dc.language | En | |
dc.publisher | Wiley-Blackwell Publishing Ltd | |
dc.source | Aquaculture Research | |
dc.title | Simulation of optimal harvesting strategies for small-scale mixed-sex tilapia (Oreochromis shiranus Boulenger 1896) ponds using a bio-economic model | |
dc.type | Journal Article | |
dcterms.bibliographicCitation | Saiti, 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.version | Peer Review | |
cg.coverage.country | Malawi | |
cg.identifier.worldfish | 943 | |
cg.subject.agrovoc | farmers | |
cg.subject.agrovoc | fishing methods | |
cg.subject.agrovoc | tilapia | |
cg.subject.worldfish | fish harvesting | |
cg.identifier.status | Limited access | |
cg.identifier.ISIindexed | ISI indexed | |
cg.contribution.worldfishauthor | Jamu, D. | |
cg.description.theme | Sustainable aquaculture | |
dc.identifier.doi | https://doi.org/10.1111/j.1365-2109.2007.01671.x | en_US |
cg.identifier.url | https://doi.org/10.1111/j.1365-2109.2007.01671.x | |
worldfish.location.area | Africa |
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Sustainable aquaculture [2702]