Variations and changes in habitat, productivity, composition of aquatic biota and fisheries of the Kyoga lake system: lessons for management

Ogutu‐Ohwayo, R.; Odongkara, K.; Okello, William; Mbabazi, D.; Wandera, SB; Ndawula, LM; Natugonza, Vianny

doi:10.2989/16085914.2013.795886

Cited by 29 publications

(47 citation statements)

References 43 publications

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“…In lakes Victoria, Kyoga and Albert, small cyprinid and characin species have increased to 40-80 % of commercial catches (Ogutu-Ohwayo et al 2013). In Lake Chilwa, the fishery has been dominated by more resilient Barbus spp., with the ability to breed in marshes and river mouths (Njaya et al 2011).…”

Section: Discussionmentioning

confidence: 99%

“…The yield of Limnothrissa miodon Boulenger in Lake Kariba decreased at an average of 24 metric tons per year between 1974 and 2003, associated with changes in rainfall and water levels (Ndebele-Murisa et al 2011). In Uganda, the contribution of a less economically valuable small fish species, Rastrineobola argentea Pellegrin in lakes Victoria and Kyoga and that of Neobola bredoi Poll and Brycinus nurse Ruppel in Lake Albert have increased to 40-80 % of the commercial catches (Ogutu-Ohwayo et al 2013). This is in line with the FAO (2010) prediction that climate change will shift fisheries to small fastgrowing, opportunistic species.…”

Section: Introductionmentioning

confidence: 99%

“…This is in line with the FAO (2010) prediction that climate change will shift fisheries to small fastgrowing, opportunistic species. Floods, droughts, tsunamis and hurricanes associated with changes in climate variables are reported to have damaged landing sites, boats and gear, disrupted fishing activities and displaced lakeside communities leading to economic losses and loss of lives (Aiken et al 1992;Broad et al 1999;Jallow et al 1999;Westlund et al 2007;Birkmann and Fernando 2008;Trotman et al 2009;Ogutu-Ohwayo et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…On Lake Chilwa, some fishers diversified to farming and pastoralism, while others migrated in response to the decrease in fish catches (Allison et al 2007;Njaya et al 2011). On lakes Victoria, Kyoga and Albert, fishers shifted from gillnets to mosquito seine nets with increases in catches of the small fish species (Ogutu-Ohwayo et al 2013). However, adaptations are location specific and influenced by local conditions, and local specific knowledge is required to guide planned adaptation to build resilience and sustain livelihoods of affected communities.…”

Section: Introductionmentioning

confidence: 99%

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Fishers’ perceptions of climate change, impacts on their livelihoods and adaptation strategies in environmental change hotspots: a case of Lake Wamala, Uganda

Musinguzi

Efitre

Odongkara

et al. 2015

Environ Dev Sustain

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Fisheries resources support livelihoods of fishing communities but are threatened by over-exploitation, habitat degradation, pollution, invasive species and climate change. Unlike the other threats, climate change has received limited consideration and reducing its risks requires appropriate adaptation strategies. This study used quantitative and qualitative methods to generate knowledge on fishers' perceptions of climate change, changes in climate variables and their impacts on livelihoods, adaptation strategies, constraints to adaptation and required interventions to promote adaptation strategies that would enable fishers to build resilience to sustain their livelihoods. We found that fishers were aware of changes in climate conditions manifested by unpredictable seasons, floods and droughts. Fishing remained the main livelihood activity. However, the dominance of fishes had changed from Nile tilapia (Oreochromis niloticus L.) to the African catfish (Clarias gariepinus Burchell). Floods and droughts were associated with damage to gears, boats, landing sites and changes in fish catches and sizes, income from fishing and fish consumption. The fishers adapted by increasing time on fishing grounds and changing target species and fishing gear among other things. Some innovative fishers diversified to high-value crops and livestock. This increased their income beyond what was solely earned from fishing which provided an incentive for some of them to quit fishing. Livelihood diversification was enhanced by use of communications technology, membership of social groups, increasing fishing days and fishing experience. Adaptation was, however, constrained by limited credit, awareness and access to land, which require interventions such as improving access to credit, irrigation facilities, appropriate planting materials and awareness raising. We identified adaptation strategies, which if promoted and their constraints addressed, could increase resilience of fishers to the influence of climate change and sustain their livelihoods.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fishers’ perceptions of climate change, impacts on their livelihoods and adaptation strategies in environmental change hotspots: a case of Lake Wamala, Uganda

Musinguzi

Efitre

Odongkara

et al. 2015

Environ Dev Sustain

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“…Oreochromis niloticus increased slowly in the lake and did not dominate the ichthyofauna until Nile perch Lates niloticus was introduced and they more or less eliminated the endemic haplochromines. Much the same happened in Lake Kyoga and it seems that competition with haplochromines might have prevented O. niloticus from becoming established [56]. If this is correct, then the impact of O. niloticus on Lake Malawi might not be too severe, especially if they can maintain their haplochromine stocks.…”

Section: Lake Malawimentioning

confidence: 99%

Broad Niche Overlap between Invasive Nile Tilapia Oreochromis niloticus and Indigenous Congenerics in Southern Africa: Should We be Concerned?

Zengeya

Booth

Chimimba

2015

Entropy

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This study developed niche models for the native ranges of Oreochromis andersonii, O. mortimeri, and O. mossambicus, and assessed how much of their range is climatically suitable for the establishment of O. niloticus, and then reviewed the conservation implications for indigenous congenerics as a result of overlap with O. niloticus based on documented congeneric interactions. The predicted potential geographical range of O. niloticus reveals a broad climatic suitability over most of southern Africa and overlaps with all the endemic congenerics. This is of major conservation concern because six of the eight river systems predicted to be suitable for O. niloticus have already been invaded and now support established populations. Oreochromis niloticus has been implicated in reducing the abundance of indigenous species through competitive exclusion and hybridisation. Despite these well-documented adverse ecological effects, O. niloticus remains one of the most widely cultured and propagated fish species in aquaculture and stock enhancements in the southern Africa sub-region. Aquaculture is perceived as a means of protein security, poverty alleviation, and economic development and, as such, any future decisions on its introduction will be based on the trade-off between OPEN ACCESSEntropy 2015, 17 4960 socio-economic benefits and potential adverse ecological effects.

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State of knowledge of aquatic ecosystem and fisheries of the Lake Edward System, East Africa

Musinguzi,

Vranken,

Natugonza

et al. 2023

Aquaculture Fish & Fisheries

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Poor and unreliable knowledge of the status of freshwater fisheries limits their inclusion in governance processes, thereby impeding effective management measures. This threatens the livelihoods of people, particularly in developing countries. Improved knowledge is required to draw the attention of policymakers and stimulate effective management measures to accelerate the sustainability of the freshwater fisheries. In line with this requirement, this paper provides the state of knowledge of the aquatic ecosystem and fisheries of the Lake Edward system, East Africa, focusing on lakes Edward, George and the Kazinga channel. The state of knowledge was accomplished by reviewing existing data and information on aspects of primary productivity and water quality, invertebrates, fish fauna, fish life history and ecology, and fisheries. The waterbodies have been monitored since the 1930s, albeit sporadically, providing data on all the above aspects but with substantial temporal gaps. Adequate and updated data and information exist on the water quality status of the water bodies, extant aquatic taxa (including fishes) and fish catches but with uncertainties in the latter. Data and information gaps exist on the abundance of biotic communities, fish life history, quantitative trophic ecology and fisheries management reference points. The aggregated data and information can directly support decisions for fisheries management. We recommend regular monitoring to fill the data and information gaps, more comprehensive stock assessments and the development of aquatic ecosystem models.

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Variations and changes in habitat, productivity, composition of aquatic biota and fisheries of the Kyoga lake system: lessons for management

Cited by 29 publications

References 43 publications

Fishers’ perceptions of climate change, impacts on their livelihoods and adaptation strategies in environmental change hotspots: a case of Lake Wamala, Uganda

Fishers’ perceptions of climate change, impacts on their livelihoods and adaptation strategies in environmental change hotspots: a case of Lake Wamala, Uganda

Broad Niche Overlap between Invasive Nile Tilapia Oreochromis niloticus and Indigenous Congenerics in Southern Africa: Should We be Concerned?

State of knowledge of aquatic ecosystem and fisheries of the Lake Edward System, East Africa

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