Increasing fish production from wetlands at Lake Victoria, Uganda using organically manured seasonal wetland fish ponds |
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Authors: | Rose C Kaggwa Anne A van Dam John S Balirwa Frank Kansiime Patrick Denny |
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Institution: | (1) National Water and Sewerage Corporation, P.O. Box 7053, Kampala, Uganda;(2) UNESCO-IHE Institute for Water Education, P.O. Box 3015, 2601 DA Delft, The Netherlands;(3) National Fisheries Resources Research Institute, P.O. Box 343, Jinja, Uganda;(4) Makerere University Institute of Environment and Natural Resources, P.O. Box 7062, Kampala, Uganda |
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Abstract: | The processes driving primary productivity and its impacts on fish production were investigated in field trials in eight seasonal
earthen wetland ponds ‘Fingerponds’ (192 m2) in Uganda between 2003 and 2005. The ponds were stocked by the seasonal flood with predominantly Oreochromis spp. at densities ranging from 0.1 to 0.5 fish m−2. Chicken manure (521, 833 or 1,563 kg ha−1) was applied fortnightly. Results showed that primary productivity was enhanced with maximum average net primary productivity
(±Standard Error) of 11.7 (±2.5) g O2 m−2 day−1 at the Gaba site and 8.3 (±1.5) g O2 m−2 day−1 at the Walukuba site. Net fish yields were higher in manured ponds with up to 2,670 kg ha−1 yield for a 310 day growth period compared to less than 700 kg ha−1 in unmanured ponds. Fish production was limited mainly by high recruitment, falling water levels, light limitation from high
suspended solids and turbidity, and low zooplankton biomass. It was concluded that Fingerponds have a high potential for sustainable
fish production and can contribute to the alleviation of protein shortages amongst the riparian communities around Lake Victoria.
Production can be enhanced further with improved stock management. |
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Keywords: | Fingerponds Fish production Manure Integrated production systems Water quality Sustainable wetland management Wise use Papyrus wetland Lake Victoria |
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