Environmental impacts of cage culture in Lake Victoria: the case of Shirati Bay-Sota, Tanzania

Kashindye, Benedicto Boniphace; Nsinda, P.; Kayanda, Robert; Ngupula, GW; Mashafi, C. A.; Ezekiel, CN

doi:10.1186/s40064-015-1241-y

Cited by 48 publications

(35 citation statements)

References 15 publications

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“…In Napoleon Gulf (Uganda), Egessa et al (2018) observed organic matter and nutrient enrichment in the sediment due to cage fish farming. In Shirati Bay (Tanzania), an increase in nutrient concentrations was observed after cage farming establishment (Kashindye et al 2015), while in Kenya, Njiru et al, (2018) reported increasing eutrophication in shallow areas due to aquaculture waste feeds. These areas are only small portions of LV where caged fish farming has occurred, but farming has begun to spread among the various B&Gs of the lake.…”

Section: Other Processes Involved In the Increasing Occurrence Of Cyamentioning

confidence: 99%

A review of the socioecological causes and consequences of cyanobacterial blooms in Lake Victoria

et al. 2020

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Africa is experiencing high annual population growth in its major river basins. This growth has resulted in significant land use change and pollution pressure on the freshwater ecosystems. Among them, the Lake Victoria basin, with more than 42 million people, is a unique and vital resource that provides food and drinking water in East Africa. However, Lake Victoria (LV) experienced a progressive eutrophication and substantial changes in the fish community leading to recurrent proliferation of water hyacinth and cyanobacteria. Based on an extensive literature review, we show that cyanobacterial biomasses and microcystin concentrations are higher in the bays and gulfs (B&Gs) than in the open lake (OL), with Microcystis and Dolichospermum as the dominant genera. These differences between the B&Gs and the OL are due to differences in their hydrological conditions and in the origins, type and quantities of nutrients. Using data from the literature, in this paper we describe the multiple ways in which the human population growth in the LV watershed is connected to the increasing occurrence of cyanobacterial blooms in the OL and B&Gs. We also described the already documented consequences of cyanobacterial blooms on food resources and fishing and on direct water use and water supply of local populations, with their potential consequences on the human health. Finally, we discuss the actions that have been taken for the protection of LV. Although many projects have been implemented in the 15 past years in order to improve the management of waste waters or to reduce deforestation and erosion, the huge challenge of the reduction of cyanobacterial blooms in LV by the control of eutrophication seems far from being achieved.

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Section: Other Processes Involved In the Increasing Occurrence Of Cyamentioning

confidence: 99%

A review of the socioecological causes and consequences of cyanobacterial blooms in Lake Victoria

et al. 2020

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“…First studies on impact of fish cage operations on surrounding water environment in L. Malawi [115,116] were minimal despite substantial discharges from the cages, due to dispersion by water currents and aggregation of wild fish species feeding on the wastes. Experimental studies on cage culture from Uganda and Tanzanian side of L. Victoria found no consistent environmental changes using water quality parameters, phytoplankton and macro-invertebrates [117,118]. Effect of nutrient discharge on DO was not pronounced.…”

Section: Persistent Organic Pollutantsmentioning

confidence: 99%

Lake Sedimentary Environments and Roles of Accumulating Organic Matter in Biogeochemical Cycling Processes and Contaminants Loading Are Invasions of Water Hyacinth in Lake Victoria from 1989 a Concern?

Mwamburi¹

2019

Persistent Organic Pollutants

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Sediments accumulated in lake basins consist of various organic and inorganic materials, mostly utilized as proxies for climatic changes and as historical records of the lake connectivity to terrestrial ecosystems and anthropogenic activities. In-lake production, aerial wet and dry deposition and transported materials in running water are the main sources of lake deposits, which may be permanently deposited as bottom sediments or remobilized through erosive forces and turbulence, resuspension, tunneling by organisms, and porewater exchanges with the overlying water mass. Examination of the sediment biodiversity, quality, composition, and stratigraphy is part of the approaches in understanding ecological and climatic changes and other anthropogenic impacts in lakes. There are no detailed studies on the spatial distribution of sediment characteristics within the Nyanza Gulf, especially after the establishment of water hyacinth. The first observations on the nature of the bottom of Lake Victoria were made during 1927-1928 survey, with subsequent detailed geochemical core studies concentrated in the main lake. Roles of sediment organic matter are explained, and data from surficial sediments collected, from about 32 sampling sites between 1994 and 2012, are used to characterize the sediments. Lastly, the potential influences from increased urbanization, eutrophication, presence of water hyacinth (Eichhornia crassipes), and associated floating macrophytes since 1989 and current cage aquaculture in L. Victoria are explored.

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“…Enhancing nutrient status as illustrated by the eutrophication problems in L. Victoria can lead to a number of undesirable effects (Hecky, Mugidde, Ramlal, Talbot & Kling, 2010). Current development of in situ fish cage aquaculture requires further monitoring and environmental risk assessment (Aura et al, 2018;Kashindye et al, 2015).…”

Section: The Way Forward and Prognosis For Sustainabilitymentioning

confidence: 99%

Prognosis for long‐term sustainable fisheries in the African Great Lakes

Irvine

Etiegni

Weyl

2018

Fisheries Management Eco

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Declines in fish yields and shifts in species composition are serious concerns in the African Great lakes of Tanganyika, Malawi (Nyasa/Niassa) and Victoria. Despite management and regulatory structures, all the lakes remain open‐access fisheries, severely depressing yields, economic returns and threatening biodiversity. While the lakes require an ecosystem‐based approach to management, this has not been realised because of a lack of institutional capacities, insufficient political will or simply being overwhelmed by the scale of the endeavour. Sustainable fisheries management can only be achieved through a refocus towards a stronger socio‐ecological approach and re‐evaluating how to realistically improve fish yield and environmental protection. This requires a combination of the following: (1) acceptance of suboptimal fish yields; (2) community‐enforced regulations that restrict access to fisheries and destruction of inshore habitats; (3) enhanced national and local institutional capacities and collaboration among the riparian states; and (4) major awareness and educational efforts that demonstrate the national and international importance of these lakes for food supply and biodiversity in pursuance of the Sustainable Development Goals. Without such actions, the prognosis for long‐term sustainable fisheries is bleak, and international projects and conferences will merely bear witness to further degradation of resources and the livelihoods they support.

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Environmental impacts of cage culture in Lake Victoria: the case of Shirati Bay-Sota, Tanzania

Cited by 48 publications

References 15 publications

A review of the socioecological causes and consequences of cyanobacterial blooms in Lake Victoria

A review of the socioecological causes and consequences of cyanobacterial blooms in Lake Victoria

Lake Sedimentary Environments and Roles of Accumulating Organic Matter in Biogeochemical Cycling Processes and Contaminants Loading Are Invasions of Water Hyacinth in Lake Victoria from 1989 a Concern?

Prognosis for long‐term sustainable fisheries in the African Great Lakes

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