Interspecific Hybridization of Tilapiines in Lake Victoria, Kenya

Ag, Wasonga; Wa, Daniel; Brian, O

doi:10.4172/2332-2608.1000235

Cited by 2 publications

(5 citation statements)

References 42 publications

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“…The introduction of O. niloticus endangered the native tilapiine species through interspecific competition, hybridization and genetic swamping (Kwikiriza et al., 2023). Currently, O. niloticus predominates the majority of fish landings, whereas other tilapiine species are rarely fished (Wasonga et al., 2017). As a result, the lake's fishery is now made up of two invasive species, L. niloticus and O. niloticus , and one native species, Rastrineobola argentea , as opposed to the lake's previous multi‐species fishery.…”

Section: Resultsmentioning

confidence: 99%

“…The abrupt decline in commercial fish harvests has led to job losses and financial losses for regional and national economies (Aloo et al., 2017). As seen by the first collapse of native tilapiines ( O. esculentus and O. variabilis ) in Lake Victoria, overfishing has also affected typical amounts of gene flow between local populations and, as a result, genetic population structure has negatively been impacted (Wasonga et al., 2017).…”

Section: Resultsmentioning

confidence: 99%

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Threats to aquatic biodiversity and possible management strategies in Lake Victoria

Muthoka,

Ogello,

Outa

et al. 2023

Aquaculture Fish & Fisheries

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Lake Victoria is the second‐largest freshwater lake in the world, with a surface area of 68,800 km2. The lake is rich in natural resources that are essential to the local economy and livelihoods. However, International Union for Conservation of Nature (IUCN) ranks 76% of freshwater species endemic to the Lake Victoria Basin as threatened with extinction. The biodiversity richness of the lake is still diminishing, and the risk of species extinction is increasing. Many species are yet to be identified, and thus the number of species threatened with extinction exceeds what is currently known. Furthermore, the lake is home to species that are found nowhere else on the planet, but its protection is never given the attention it needs. Genetic diversity loss is harmful to future populations and influences sustainability of the ecosystem. The decline in Lake Victoria's biodiversity is primarily attributed to various pressing issues, including water pollution, invasive species, climate change, overexploitation and the challenges stemming from high human population density. These problems are exacerbated by inadequate regulatory enforcement and a lack of comprehensive data and information to inform and guide conservation efforts. If these factors are not addressed, they may have a detrimental impact on Lake Biodiversity. This article aims to document the main threats to aquatic biodiversity as well as potential management strategies for preventing further losses of the aquatic biodiversity in Lake Victoria. The study recommends reviewing, bolstering and reinforcing the rules and regulations governing the extraction, accessibility and discharge of nutrients into the lake. The national governments should work with local governments, non‐governmental organizations and local people to safeguard and conserve the lake's biodiversity. The national governments of the riparian nations should also reserve funds each fiscal year specifically for research that would inform effective management measures to prevent further losses of the lake's biodiversity.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Threats to aquatic biodiversity and possible management strategies in Lake Victoria

Muthoka,

Ogello,

Outa

et al. 2023

Aquaculture Fish & Fisheries

View full text Add to dashboard Cite

show abstract

“…Escape reporting Documentation of the nature, scale and timing of any farm escapes Provide information to farmers on the appropriate channel to report escape events for early detection (Wasonga et al, 2017). Requirement for immediate reporting of the situation, with any remedial actions taken.…”

Section: Discussionmentioning

confidence: 99%

“…Provide information to farmers on the appropriate channel to report escape events for early detection (Wasonga et al, 2017).…”

Section: Recommendations For Future Research and Policy Developmentmentioning

confidence: 99%

“…For example, a study conducted in Volta Lake, Ghana using The risk and impact of fish farm escapes on aquatic ecosystems depends on the farming system employed. With intensive aquaculture now occupying a strategic position within the fisheries sector, cage systems are now being employed in important fishing lakes such as the great East African lakes, where the negative impact of O. niloticus escapes on native Oreochromis variabilis and Oreochromis esculentus has been realized (Wasonga et al, 2017). In 2006, both native species were declared critically endangered by the IUCN (2022) as a result of their hybridization with O. niloticus.…”

Section: Local Genetic Improvement Programmesmentioning

confidence: 99%

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The potential impact of aquaculture on the genetic diversity and conservation of wild fish in sub‐Saharan Africa

Sanda,

Metcalfe,

Mable

2024

Aquatic Conservation

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An increasing focus on aquaculture using introduced strains or species poses a serious threat to native wild species in sub‐Saharan Africa, yet almost no policies have been enacted or regulations put in place to address this environmental challenge. Aquaculture in these regions has traditionally been conducted on a relatively small scale but is currently expanding rapidly and is projected to continue increasing in the coming decades, with increasing use of genetically improved strains. This expansion is occurring in a region known for its high biodiversity, creating challenges for increasing fish production without damaging wild fish populations. However, few studies have yet assessed the impacts of changes in aquaculture practice on the genetic composition and diversity of wild populations. The use of non‐native improved strains for aquaculture could cause competition, gene introgression when there is interbreeding with native populations or species, displacement of species and possible extinction of the native wild populations. After providing historical context on African aquaculture, this review describes the current methods of fish breeding and genetic improvement programmes for the main species of cultured fishes, focusing on the potential conservation impacts of the use of introduced (and selectively bred) farmed species. Existing aquaculture policies, legislation and regulations regarding the import and farming of fish are then compared across the main fish‐producing countries. We recommend a regional policy framework considering fish introduction, risk analysis and risk management, human resources development and genetic monitoring that could be drafted into the existing policies to strengthen conservation efforts. We conclude by making recommendations for refining existing regulations and for future research aimed at minimizing the impacts of aquaculture on wild fish populations in sub‐Saharan Africa. Aquaculture in this region needs implementation of responsible guidelines to avoid genetic impacts on native populations of high conservation value.

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Interspecific Hybridization of Tilapiines in Lake Victoria, Kenya

Cited by 2 publications

References 42 publications

Threats to aquatic biodiversity and possible management strategies in Lake Victoria

Threats to aquatic biodiversity and possible management strategies in Lake Victoria

The potential impact of aquaculture on the genetic diversity and conservation of wild fish in sub‐Saharan Africa

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