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Lake Victoria in Uganda

Lake Victoria is the world’s largest tropical lake and the largest lake in the African Great Lakes region. The lake supports the largest freshwater fishery in the world, producing 1 million tons of fish per year and employing 200,000 people in supporting the livelihoods of 4 million people. The major threats to the lake are deforestation, land use change, wetland degradation and discharge from urban areas, industries and farmlands.


The Lake Victoria basin is home to about 40 million people with an average population density of 250 people per square km. The basin population is growing at a rate of 3.5 percent each year, which is among the highest population growth rates in the world. BBC

The basin countries (apart from Kenya) are among the poorest in the world, with most of their population living on less than $1.25 per day. Many of the people have no access to clean water or improved sanitation facilities, resulting in high incidences of water-related diseases such as malaria, bilharzia, and cholera. The HIV prevalence of about 24 percent is higher than national averages of ~5-7 percent in other similar countries.

Lake Victoria is the largest African Great Lake by area, the world’s largest tropical lake, and the second largest fresh water body in the world. The lake has gone through major changes in biodiversity, and has been the site of the most development and conservation projects, both failures and successes, of all the African Great Lakes. Lake Victoria was formed about 400,000 years ago, and lies 1,134 m above sea level.

It has a surface area of 68,800 km2, an average depth of 40 m, a maximum depth of 80 m, a volume of 2,760 km3, and a basin area of 195,000 km2, which extends to Rwanda and Burundi. The shoreline is shared by Kenya (6%), Uganda (43%), and Tanzania (51%). The Kagera, Katonga, Sio, Yala, Nyando, Sondu Miriu, and Mara rivers feed the lake and the River Nile carries water out of the lake.

The climate in the lake basin varies from tropical rain forest with rainfall over the lake for much of the year to a semi dry climate with intermittent droughts over some areas, and with temperatures varying between 12-26°C. Most of the lake’s water comes from rainfall (117 km3/year), while almost the same amount of water is lost through evaporation (105 km3/year) and carried out by the Nile (33 km3/year).

The natural vegetation of the basin consists of patches of closed evergreen forest along the western and northern shores with open landscapes and swamp wetlands in bays, making a suitable habitat for birds, crocodiles, and hippopotamus. The lake dried out about 17,300 years ago and refilled beginning about 14,700 years ago.


Before the 1960s, the lake had had high fish species diversity of more than 500 fish species, mostly local cichlids, carps, and minnows, but these were reduced to less than 300 species after the Nile perch was introduced, which caused a decrease in the clearness of the water.

Lake Victoria supports the largest freshwater fishery in the world which by 2015 was producing one million tons of fish per year. The lake employs about 200,000 people in direct fishing and supports livelihoods of up to four million people. The lake generates over 150 million dollars in export earnings, and provides high quality fish protein to about eight million people in the basin.

The lake is an important transport route linking the East African States, is a reservoir for at least four hydropower stations along the Nile, provides water for industrial and domestic use, and regulates local climate. It has the largest number of urban areas in its basin of all the African Great Lakes, and its wetlands receive and treat waste water from both urban and agricultural areas.

Two introduced species, Nile Perch (Lates niloticus) and Nile Tilapia (Oreochromis niloticus) and one native species, Silver Cyprinid (Rastrineobola argentea), currently form the main fishery and present opportunities for value added fish products. Cage culture started on the lake in 2006 and by 2015 was producing about 8,000 tons of fish per year. The lake basin has fertile soils with a climate that supports cash crops such tea and coffee and food crops such as beans, maize and bananas.

Most industrial expansion in the African Great Lakes region is in the Lake Victoria basin. Some minerals, such as gold, are mined in the lake basin. Several tourism destinations exist on islands and shorelines and there is potential for sport fishing, boating, and cruising safaris.


The original fishery of Lake Victoria consisted of native tilapias but this collapsed during the first half of the 20th century, mainly due to overfishing. Deforestation, land use change, loss of wetland quality, and waste from urban areas, industries and farm lands have polluted the lake and led to loss in water quality, algae blooms, loss of oxygen in the lake and, sometimes, fish kills.

These are expected to worsen with the predicted increase in urban areas and other development such as cage fish culture and climate change. Habitat loss and predation by the introduced Nile Perch contributed to the extinction of about 60 percent of the cichlid species. Introduced tilapias, including Nile Tilapia, are taking over the populations of native tilapias.

In 1989, the lake was invaded by the water hyacinth (Eichhornia crassipes) which lowered water quality. Another invasive weed, Salvenia molesta, is spreading quickly in Lake Kyoga and might invade Lake Victoria. Water levels have been dropping since 1960 due to changes in climate. Climate warming triggered ecosystem changes that led to increased water pollution and changes in lake productivity after the 1970s.

Dam construction along the rivers flowing in and out of the lake provides much needed power for the numerous urban areas in the basin, but these dams regulate water flow, which affects water balance, lake biodiversity, and migratory fishes. There have been some conflicts related to resource access between countries sharing the lake.

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