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106-626: Lake Victoria is one of the African Great Lakes . With a surface area of approximately 59,947 km (23,146 sq mi), Lake Victoria is Africa's largest lake by area, the world's largest tropical lake, and the world's second-largest fresh water lake by surface area after Lake Superior in North America. In terms of volume, Lake Victoria is the world's ninth-largest continental lake , containing about 2,424 km (1.965 × 10 acre⋅ft) of water. Lake Victoria occupies

212-470: A depression between the Eastern and Western Rifts, formed by the uplift of the rifts to either of its sides. Around two to three million years ago, Lake Turkana was larger and the area more fertile, making it a center for early hominids . Richard Leakey led numerous anthropological excavations in the area, which yielded many important discoveries of hominin remains. The two-million-year-old Skull 1470

318-548: A few species are extinct in the wild (only survive in captivity). Before the mass extinction that has occurred among the lake's cichlids in the last 50 years, about 90 percent of the native fish species in the lake were haplochromines. Disregarding the haplochromines, the only native Victoria cichlids are two critically endangered tilapia, the Singida tilapia or ngege ( Oreochromis esculentus ) and Victoria tilapia ( O. variabilis ). In 1927–1928 Michael Graham conducted

424-601: A great deal of intense debate within the scientific community of the day, but also much interest by other explorers keen to either confirm or refute Speke's discovery. In the late 1860s, the famous Scottish explorer and missionary David Livingstone failed in his attempt to verify Speke's discovery, instead pushing too far west and entering the River Congo system instead. Ultimately, the Welsh-American explorer Henry Morton Stanley , on an expedition funded by

530-706: A region with great potential after independence, the Great Lakes region has suffered from civil war and conflict in the four decades around the turn of the 21st century ( c.  1980 –2020). In 2022 the United Nations High Commissioner for Refugees commended Tanzania for consistently welcoming and aiding refugees from other countries in the region. The highlands are relatively cool, with average temperatures ranging between 17 °C (63 °F) and 19 °C (66 °F) and abundant rainfall. Major drainage basins include those of

636-791: A result of the spread of the invasive water hyacinth (an optimum snail habitat), and the loss of many snail-eating cichlids in the lake. Evarcha culicivora is a species of jumping spider (family Salticidae ) found only around Lake Victoria in Kenya and Uganda. It feeds primarily on female mosquitos. Lake Victoria supports Africa's largest inland fishery (as of 1997). Initially the fishery involved native species, especially tilapia and haplochromine cichlids, but also catfish ( Bagrus , Clarias , Synodontis and silver butter catfish), elephantfish, ningu ( Labeo victorianus ) and marbled lungfish ( Protopterus aethiopicus ). Some of these, including tilapia and ningu ( Labeo victorianus ), had already declined in

742-612: A second hydroelectric complex in the area, the Kiira Hydroelectric Power Station , with World Bank assistance. By 2006, the water levels in Lake Victoria had reached an 80-year low, and Daniel Kull, an independent hydrologist living in Nairobi , Kenya, calculated that Uganda was releasing about twice as much water as is allowed under the agreement, and was primarily responsible for recent drops in

848-508: A serious problem of urban planning because it started out not as a town but as shopping center besides the Kenya-Tanzania A-1 international road. As such, town has buildings on each side of the main highway which is paved. The subsequent streets after the main highway are not paved and are poorly managed. There has not been effective response from the government to re-plan the town to accommodate aesthetics and necessities. In 2013,

954-656: A shallow depression in Africa. The lake has an average depth of 40 m (130 ft) and a maximum depth of 80–81 m (262–266 ft). Its catchment area covers 169,858 km (65,583 sq mi). The lake has a shoreline of 7,142 km (4,438 mi) when digitized at the 1:25,000 level, with islands constituting 3.7% of this length. The lake's area is divided among three countries: Tanzania occupies 49% (33,700 km (13,000 sq mi)), Uganda 45% (31,000 km (12,000 sq mi)), and Kenya 6% (4,100 km (1,600 sq mi)). The lake

1060-490: A sieve. The water is then ready to be chlorinated or treated in another way. The sand filtration helps reduce water-borne diseases and is based on the use of the local environment. The only outflow for Lake Victoria is at Jinja, Uganda, where it forms the Victoria Nile. The water for at least 12,000 years has drained across a natural rock weir. In 1952, engineers acting for the government of Colonial Uganda blasted out

1166-430: Is Caridina nilotica , which is common and widespread in Lake Victoria. Lake Victoria is home to 28 species of freshwater snails (e.g., Bellamya , Biomphalaria , Bulinus , Cleopatra , Gabbiella , and Melanoides ), including 12 endemic species/subspecies. There are 17 species of bivalves ( Corbicula , Coelatura , Sphaerium , and Byssanodonta ), including 6 endemic species and subspecies. It

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1272-583: Is a part of the same river system known as the White Nile and is occasionally referred to as such, strictly speaking this name does not apply until after the river crosses the Uganda border into South Sudan to the north. The lake exhibits eutrophic conditions . In 1990–1991, oxygen concentrations in the mixed layer were higher than in 1960–1961, with nearly continuous oxygen supersaturation in surface waters. Oxygen concentrations in hypolimnetic waters (i.e.,

1378-466: Is already experiencing spillover development and growth as a result of its expansive and vast swathe of land that is still available for commercial, residential and farming purposes at relatively low prices. The near-border town is already boasting of remarkable developments in terms of infrastructure, social amenities, as well as physical development. The town's infrastructure has greatly improved, with some roads being paved and others tarmacked, opening up

1484-475: Is also set to open up our town and our lake Victoria beaches to the Masai Mara game park hence spurring growth of tourism and hospitality industries. In the last five years alone, we have seen rapid transformation, with the construction of numerous commercial buildings, mid level hotels and restaurants, emerging shopping malls, unprecedented number of supermarkets and residential flats. Underway are plans by

1590-465: Is being altered and in some cases, broken by the indiscriminate eating habits of the Nile perch. The subsequent decrease in the number of algae-eating fish allows the algae to grow at an alarming rate, thereby choking the lake. The increasing amounts of algae, in turn, increase the amount of detritus (dead plant material) that falls to the deeper portions of the lake before decomposing. As a by-product of this

1696-544: Is between March and May. Average rainfall is approximately 1200 mm and above, but the rainfall patterns are unique, as the small town has three patterns of rainfall according to the neighborhood. It could rain in Kakrao but around Onyalo school would be very dry and Namba would have a slight drizzle. The soils are well-drained and tend to be loamy. This favors the cultivation of tobacco, sugarcane, maize, beans, coffee, groundnuts and vegetables. However, agricultural production

1802-671: Is connected by road to the Masai Mara national park, but the road is in poor condition. Migori town is immediately after Awendo, (where the Sony Sugar Company is situated), Oyani, Stella and Kakrao areas. The road to Isebania is well tarmacked from Kakrao to Mwanza in Tanzania. The road connecting Migori town to Masara is also currently tarmacked. Air passengers in Migori are served by Migori Airport . Migori annually holds

1908-496: Is excessively polluted by residents and companies. Jesse Sikali's article in The Standard reported that Migori was experiencing a high demand for highrise buildings as a result of increased demand for office and residential spaces. The demand for new houses has started a process of gentrification of the city as older buildings are being taken down and replaced by newer modern looking buildings. Besides buying out poorer owners,

2014-407: Is home to hundreds of species of birds endemic to Kenya. The flamingo wades in its shallows. The East African rift system also serves as a flyway for migrating birds, bringing in hundreds more. The birds are essentially supported by plankton masses in the lake, which also feed the fish there. Vegetation ranges from rainforest to savanna grasses. In some lakes, rapidly growing invasive plants, like

2120-458: Is home to many species of fish which live nowhere else, especially cichlids . Invasive fish, such as the Nile perch , have driven many endemic species to extinction . Though having multiple local language names ( Swahili : Ukerewe ; Dholuo : Nam Lolwe ; Luganda : 'Nnalubaale ; Kinyarwanda : Nyanza ), the lake was renamed after Queen Victoria by the explorer John Hanning Speke ,

2226-541: Is hot and very dry. A short rainy season in October is followed by a longer one from April to May. The Western Rift Valley lakes are freshwater and home to an extraordinary number of endemic species. More than 1,500 cichlid fish species live in the lakes, as well as other fish families. The lakes are also important habitats for a number of amphibian species. Nile crocodiles are numerous. Mammals include elephants , gorillas and hippopotamus . The Lake Turkana area

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2332-633: Is in remission and this trend could be permanent if control efforts are continued. Pollution of Lake Victoria is mainly due to discharge of raw sewage into the lake, dumping of domestic and industrial waste, and fertiliser and chemicals from farms. The Lake Victoria basin, while generally rural, has many major centres of population. Its shores are dotted with key cities and towns, including Kisumu , Kisii , and Homa Bay in Kenya; Kampala , Jinja and Entebbe in Uganda; and Bukoba, Mwanza , and Musoma in Tanzania. These cities and towns are also home to many factories that discharge some chemicals directly into

2438-451: Is likely that undescribed species of snails remain. Conversely, genetic studies indicate that some morphologically distinctive populations, traditionally regarded as separate species, may only be variants of single species. Two of the snail genera, Biomphalaria and Bulinus , are intermediate hosts of the parasite that causes bilharzia (schistosomiasis). Human infections by this parasite are common at Lake Victoria. This may increase as

2544-423: Is near-endemic. Four species of freshwater crabs are known from Lake Victoria: Potamonautes niloticus is widespread in the lake and P. emini has been recorded from the vicinity of Bukoba in Tanzania, but both are also found elsewhere in Africa. The last were first scientifically described in 2017 and very little is known about them: P. entebbe is only known from near Entebbe (the only known specimen

2650-409: Is now $ 80. Three bedroom houses are now $ 100 from $ 80 three years back. Some of the houses are fully furnished to accommodate transient lifestyles. The elevation is roughly 1500 meters above sea level (asl.) at Kakrao descending by 100 m asl. into the Migori river. The different peaks near the town are a little over 1550 m asl. Rainfall is in two seasons like in most of Kenya and the highest rainfall

2756-451: Is restricted by the drought periods if no irrigation water is available. The town is home to the Suna people with a significant immigrant luo community in between. Recent migration has introduced a significant number of Maragolis. It is not surprising thus, that many villagers around the town speak Maragoli and Luo e.g. Ojijo pastor. There are also significant numbers of Kisiis, Kikuyus (Though

2862-503: The New York Herald newspaper, confirmed the truth of Speke's discovery, circumnavigating the lake and reporting the great outflow at Ripon Falls on the lake's northern shore. Many towns and cities are reliant on Lake Victoria for their water supplies, for farming and other uses. The Lamadi water scheme is a water and sanitation project that serves Mwanza and the satellite towns of Lamadi, Misungwi, Magu, Bukoba, and Musoma on

2968-482: The African humid period began. Lake Victoria receives 80 percent of its water from direct rainfall. Average evaporation on the lake is between 2.0 and 2.2 metres (6.6 and 7.2 ft) per year, almost double the precipitation of riparian areas. Lake Victoria receives its water additionally from rivers, and thousands of small streams . The Kagera River is the largest river flowing into this lake, with its mouth on

3074-441: The hippopotamus , African clawless otter , spotted-necked otter , marsh mongoose , sitatunga , bohor reedbuck , defassa waterbuck , cane rats , and giant otter shrew . Lake Victoria and its wetlands has a large population of Nile crocodiles , as well as African helmeted turtles , variable mud turtles , and Williams' mud turtle . The Williams' mud turtle is restricted to Lake Victoria and other lakes, rivers, and swamps in

3180-454: The 2009 Kenya National Census. It is possible that the population of the town has increased due to the growth of the size of the urban sprawl and the 2010 Constitution which made Migori town the capital of Migori County bringing workers and an assortment in investments. Once a small administrative center inhabited only by the native Suna people and adjudicated from the then South Nyanza District headquarters of Kisii and later on Homabay Town,

3286-561: The African Great Lakes, grouped by drainage basin . The exact number of lakes considered part of the African Great Lakes varies by list, and may include smaller lakes in the rift valleys, especially if they are part of the same drainage basin as the larger lakes, such as Lake Kyoga . The Great Lakes region (rarely: Greater Lakes region) consists of ten riparian countries: Burundi , the Democratic Republic of

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3392-465: The Congo , Ethiopia , Kenya , Malawi , Mozambique , Rwanda , Tanzania , Uganda , and Zambia . The adjective interlacustrine ("between lakes") can refer to the region, or more specifically, the nations or area bounded by the lakes. The Swahili language is the most commonly spoken language in the African Great Lakes region. It also serves as a national or official language of five nations in

3498-597: The Congo-Zaire, Nile, and Zambezi rivers, which drain into the Atlantic Ocean , Mediterranean Sea , and Indian Ocean , respectively. Forests are dominant in the lowlands of the Congo-Zaire Basin, while grasslands and savannas (dry grasslands) are most common in the southern and eastern highlands. Temperatures in the lowlands average about 35 °C (95 °F). Around Lake Turkana , the climate

3604-471: The County Government of Migori paved a second bridge over River Migori to ease congestion at the urban center. Most of the residents in this city live in unmarked or non-addressed buildings and the streets have no names. The city is also crossed by a permanent river dividing the town right in the middle but the riverside has no proper development such as a waterfront or a side-walk. The river itself

3710-529: The DRC. GDP per capita fluctuates between $ 600 in DRC and Burundi and $ 800 in Uganda. Migori Migori county 044 , also known as Suna-Migori , is a multi-ethnic municipal town which acts as the capital of Migori County , Kenya . The town is located 63 kilometers south of Kisii town and 22 km north of the Tanzanian border. The Migori Metropolitan area consists of Migori municipality and

3816-605: The Great Lakes. Believing he had found the source of the Nile on seeing this "vast expanse of open water" for the first time, Speke named the lake after Queen Victoria. Burton, who had been recovering from illness at the time and resting further south in Kazeh (near present-day Tabora ), was outraged that Speke claimed to have proved his discovery to have been the true source of the Nile River, which Burton regarded as still unsettled. A very public quarrel ensued, which not only sparked

3922-581: The Islamic quarter begin at 4:00 am and can be heard throughout the town. There has been gold mining activities in the area. Mining was centered in Macalader area of Migori on the way to Sori (Karungu Bay). There is a significant gold mining activity in Rongo constituency of migori county. Most activity is centered on the main highway that crosses the town. Most activity is Small and Micro enterprises largely

4028-535: The Jua Kali with a concentration in auto mechanics, furniture works, tailoring, welding, trade and agriculture. Agricultural produce comes from surrounding areas like Ngege, oyani, anjego etc. Other profit making organisations include Barclays, KCB, K-rep, family finance, Co-op and Post banks. in the 1980s to early 1990s, the town was well known as a hotbed of benga music . Several luo benga musicians like Ouma Omore and Prince Jully recorded and performed benga music in

4134-852: The Migori Agricultural Society at the Migori Municipal Stadium. Farmers and cooperatives assemble at the fair to showcase their products. Usually, the function is also graced by traditional dances, fashion shows, horse racing, disco dances, and inter school sports. Jacquie Jones wrote and published a poem titled "Migori" in Obsidian II Vol 2: No: 3 ( Winter 1987). The poem goes: Migori in migori you can get cold beer and bata shoes you can get samosa and chocolate and pillows you can go dancing and buy film change money they have flush toilets soon they say you can even get cheese there

4240-467: The Nile perch, since that requires a significant amount of capital resources. The water hyacinth has become a major invasive plant species in Lake Victoria. The release of large amounts of untreated wastewater (sewage) and agricultural and industrial runoff directly into Lake Victoria over the past 30 years has greatly increased the nutrient levels of nitrogen and phosphorus in the lake "triggering massive growth of exotic water hyacinth, which colonised

4346-580: The Owen Falls Dam in 1954. This allowed it to spread to Lake Kyoga where additional Nile perch were released in 1955, but not Victoria itself. Scientists argued that further introduction should wait until research showed the effect of the introduction in Kyoga, but by the late 1950s, Nile perch began being caught in Lake Victoria. As the species was already present, there were few objections when more Nile perch were transferred to Victoria to further bolster

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4452-447: The Owen Falls Dam when shut down for maintenance, but this is considered highly unlikely by many scientists. The Nile perch had spread throughout the lake by 1970. Initially the population of the Nile perch was relatively low, but a drastic increase happened, peaking in the 1980s, followed by a decline starting in the 1990s. Due to the presence of the Nile perch, the natural balance of the lake's ecosystem has been disrupted. The food chain

4558-483: The adjacent smaller towns. The area has eight constituencies, namely Rongo, Awendo, Suna East, Suna West, Uriri, Nyatike, Kuria East and Kuria West with a total population of 393,012 according to the Kenya National Bureau of Statistics -sponsored national census of 2019. The neighboring town/constituency of Awendo had 96,872 and Kuria East (Sirare) had 117, 290. In 2010, The Star newspaper reported that

4664-441: The area and some pine has been grown successfully. The birdlife in Migori is varied with many records of blue flycatcher , blue-spotted wood dove, harrier hawk, bat hawk , baglafecht weaver , tawny eagle, purple grenadier , beautiful sunbird, yellow-billed stork, hadada ibis, African citril , cape turtle dove , paradise flycatcher, yellow white eye, white-browed robin chat, black-headed gonolek, black kite among others. Migori

4770-460: The bank of Lake Victoria.  European Investment Bank started the project in 2013 with the aim of protecting the environmental health of the lake, through improved water and sanitation to the towns whose pollution is part of the degradation of the lake. The project aims to provide safe drinking water for an estimated one million people and improved sanitation for 100 000 people. Sediment and suspended solids are filtered out using sand, which acts like

4876-460: The colonial government. In the following decades, the pressure to introduce the Nile perch continued, as did warnings about the possible effects of doing it. The first introduction of Nile perch to the region, done by the Uganda Game and Fisheries Department (then part of the colonial government) and local African fish guards, happened upstream of Murchison Falls directly after the completion of

4982-570: The complete disappearance of many endemic cichlid species has been called the "most dramatic example of human-caused extinctions within an ecosystem". Starting in the 1950s, many species have been introduced to Lake Victoria where they have become invasive and a prime reason for the extinction of many endemic haplochromine cichlids. Among the introductions are several tilapias : redbreast ( Coptodon rendalli ), redbelly ( C. zillii ), Nile ( Oreochromis niloticus ) and blue-spotted tilapias ( O. leucostictus ). Although these have contributed to

5088-428: The county government for a modern bus terminus at Namba junction and a modern market to rid the town of roadside hawkers and stalls. The ever increasing number of financial institutions that now stands at over 10 besides numerous Sacco and micro finances crowns it all. More residential and commercial buildings are still coming up as every strategic investor seeks to lay their stake in this emerging economy. The town faces

5194-539: The current Lake Victoria basin . During its geological history, Lake Victoria went through changes ranging from its present shallow depression, through to what may have been a series of much smaller lakes. Geological cores taken from its bottom show Lake Victoria has dried up completely at least three times since it formed. These drying cycles are probably related to past ice ages , which were times when precipitation declined globally. Lake Victoria last dried out about 17,300 years ago, and it refilled 14,700 years ago as

5300-419: The detritivores). The zooplanktivores have been least affected and in the late 1990s had reached densities similar to, or above, the densities before the drastic declines, although consisting of fewer species and often switching their diet towards macroinvertebrates . Some of the threatened Lake Victoria cichlid species have captive "insurance" populations in zoos, public aquaria and among private aquarists, and

5406-415: The ecosystem, it is estimated that at least 200 species (about 40 percent) of Lake Victoria haplochromines have become extinct, including more than 100 undescribed species. Initially it was feared that this number was even higher, by some estimates 65 percent of the total species, but several species that were feared extinct have been rediscovered after the Nile perch started to decline in the 1990s. Several of

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5512-478: The end of 2001. Greater growth was observed in the northern part of the lake, in relatively protected areas, which may be linked to current and weather patterns and could also be due to the climate and water conditions, which are more suitable to the plants growth (as there are large urban areas to the north end of the lake, in Uganda). The invasive weed was first attempted to be controlled by hand, removed manually from

5618-415: The extinction of native fish by causing significant changes to the ecosystem , outcompeted natives and (in the case of the Nile tilapia) possibly hybridized with the highly threatened native tilapias, the most infamous introduction was the large and highly predatory Nile perch ( Lates niloticus ). As early as the 1920s, it was proposed to introduce a large pelagic predator such as the Nile perch to improve

5724-411: The eyes (giving them better sight in turbid water) and smaller head/larger caudal peduncle (allowing faster swimming). The piscivorous (affected by both predation and competition from Nile perch), molluscivorous and insectivorous haplochromines were particularly hard hit with many extinctions. Others have become extinct in their pure form, but survive as hybrids between close relatives (especially among

5830-482: The fertility of the lake is dependent on the rate at which these nutrients can be taken up by fish and other organisms. There is little doubt that Haplochromis played an important role in returning detritus and plankton back into solution. With some 80 percent of Haplochromis species feeding off detritus, and equally capable of feeding off one another, they represented a tight, internal recycling system, moving nutrients and biomass both vertically and horizontally through

5936-484: The first Briton to document it in 1858, while on an expedition with Richard Francis Burton . Geologically, Lake Victoria is relatively young at about 400,000 years old. It was formed when westward-flowing rivers were dammed by an upthrown crustal block. During the Miocene era, what is now the catchment area of the lake was on the western side of an uplifted area that functioned as a continental divide, with streams on

6042-491: The first ever systematic Fisheries Survey of Lake Victoria . In his official report of the expedition, Graham wrote that "The ngege or satu Tilapia esculenta , is the most important food fish of the lake, whether for native or non-native consumption. No other fish equals it in the quality of the flesh. It is convenient size for trade, travels well and is found in much greater numbers than other important fish, such as semutundu (Luganda), Bagrus sp. ". Furthermore, Graham noted that

6148-404: The first half of the 20th century due to overfishing . To boost fishing, several species of non-native tilapia and Nile perch were introduced to the lake in the 1950s. Nevertheless, the natives continued to dominate fisheries until the 1970s where their decline meant that there was a strong shift towards the non-native Nile tilapia (now 7 percent of catches), non-native Nile perch (60 percent) and

6254-512: The first true bathymetric map of the lake. The deepest part of the lake is offset to the east of the lake near Kenya and the lake is generally shallower in the west along the Ugandan shoreline and the south along the Tanzanian shoreline. Many mammal species live in the region of Lake Victoria, and some of these are closely associated with the lake itself and the nearby wetlands. Among these are

6360-400: The fisheries in the lake. At the same time it was warned that this could present a serious danger to the native fish species and required extensive research into possible ecological effects before done. These warnings primarily concerned the native tilapia O. esculentus , as the smaller haplochromine cichlids (despite playing an important role in local fisheries) were regarded as "trash fish" by

6466-458: The inland routes in search of gold , ivory , other precious commodities, and slaves . The lake existed and was known to many Africans in the catchment area who left no written records long before it was sighted by a European in 1858 when the British explorer John Hanning Speke reached its southern shore while on his journey with Richard Francis Burton to explore central Africa and locate

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6572-514: The intake of water for industries. On the other hand, water hyacinth mats can potentially have a positive effect on fish life in that they create a barrier to overfishing and allow for fish growth, there has even been the reappearance of some fish species thought to have been extinct in recent years. The overall effects of the water hyacinth, however, are still unknown. Growth of the water hyacinth in Lake Victoria has been tracked since 1993, reaching its maxima biomass in 1997 and then declining again by

6678-412: The interior areas for growth and expansion. The construction of Kiringi bridge and the proposed Nyikendo-Nyamanga bridge is set to open up the town for more commercial space. The nearly Concluded tarmacking of Migori-Transmara road is expected to shorten the turnaround time of doing business with the capital city of Nairobi as its expected to reduce the current road distance by about 3 hours. The Mara road

6784-409: The introduction of MV  Uhuru and MV  Umoja . The ferry MV Bukoba sank in the lake on 21 May 1996 with a loss of between 800 and 1,000 lives, making it one of Africa's worst maritime disasters. Another tragedy occurred recently on 20 September 2018 that involved the passagers ferry MV Nyerere from Tanzania that caused the deaths of over 200 people. On 6 November 2022, Lake Victoria

6890-545: The introduction of Nile perch , the extinction of cichlids in the genus Haplochromis has also been blamed on the lake's eutrophication. The fertility of tropical waters depends on the rate at which nutrients can be brought into solution. The influent rivers of Lake Victoria provide few nutrients to the lake in relation to its size. Because of this, most of Lake Victoria's nutrients are thought to be locked up in lake-bottom deposits. By itself, this vegetative matter decays slowly. Animal flesh decays considerably faster, however, so

6996-804: The introduction of the European flax gill net of 5 inch mesh had undoubtedly caused a diminution in the number of ngege in those parts of the Kavirondo Gulf, the northern shore of the lake, the Sesse Islands and Smith's Sound which are conveniently situated close to markets. Survey catches in 1927–28 included several Haplochromis species that are now thought to be extinct, including: Haplochromis flavipinnis , Haplochromis gowersii , Haplochromis longirostris , Haplochromis macrognathus , Haplochromis michaeli , Haplochromis nigrescens , Haplochromis prognathus . As well as being due to

7102-405: The lake for its natural resources. Hundreds of endemic species that evolved under the special conditions offered by the protection of Lake Victoria have been lost due to extinction, and several more are still threatened. Their loss is devastating for the lake, the fields of ecology, genetics and evolution biology, and more evidently, for the local fisheries. Local fisheries once depended on catching

7208-409: The lake in the late 1990s". This invasive weed creates anoxic (total depletion of oxygen levels) conditions in the lake, inhibiting decomposing plant material, raising toxicity and disease levels to both fish and people. At the same time, the plant's mat or "web" creates a barrier for boats and ferries to maneuver, impedes access to the shoreline, interferes with hydroelectric power generation, and blocks

7314-470: The lake or its influent rivers. The set up of small beaches and local authorities around the lake lack proper sewage treatment facilities allowing pollutants to find their way into the water. Large parts of these urban areas also discharge untreated (raw) sewage into the river, increasing its eutrophication that in turn is helping to increase the invasive water hyacinth. Increased logging and act of deforestation has led to environmental degradation around

7420-405: The lake's level. Since the 1900s, Lake Victoria ferries have been an important means of transport between Uganda, Tanzania, and Kenya. The main ports on the lake are Kisumu, Mwanza, Bukoba, Entebbe , Port Bell , and Jinja. Until 1963, the fastest and newest ferry, MV Victoria , was designated a Royal Mail Ship . In 1966, train ferry services between Kenya and Tanzania were established with

7526-514: The lake's western shore. Lake Victoria is drained solely by the Nile River near Jinja, Uganda, on the lake's northern shore. In the Kenya sector, the main influent rivers are the Sio , Nzoia , Yala , Nyando , Sondu Miriu , Mogusi , and Migori . The only outflow from Lake Victoria is the Nile River, which exits the lake near Jinja, Uganda. In terms of contributed water, this makes Lake Victoria

7632-491: The lake's wide area; from increased nutrient inflows via rivers, and from increased pollution associated with settlement along its shores. Between 2010 and 2022 the surface area of Lake Victoria increased by 15% flooding lakeside communities. The lake is considered a shallow lake considering its large geographic area with a maximum depth of approximately 80 metres (260 ft) and an average depth of 40 metres (130 ft). A 2016 project digitized ten-thousand points and created

7738-444: The lake; however, re-growth occurred quickly. Public awareness exercises were also conducted. More recently, measures have been used such as the introduction of natural insect predators, including two different water hyacinth weevils and large harvesting and chopping boats, which seem to be much more effective in eliminating the water hyacinth. A green power plant that uses harvested water hyacinth (but also can use other degradable waste)

7844-632: The layer of water that lies below the thermocline , is noncirculating, and remains perpetually cold) were lower in 1990–1991 for a longer period than in 1960–1961, with values of less than 1 mg per litre (< 0.4  gr /cu ft) occurring in water as shallow as 40 metres (130 ft) compared with a shallowest occurrence of greater than 50 metres (160 ft) in 1961. The changes in oxygenation are considered consistent with measurements of higher algal biomass and productivity. These changes have arisen for multiple reasons: successive burning within its basin, soot and ash from which has been deposited over

7950-404: The lungfish, tilapia, carp and catfish that comprise the local diet. Today, the composition and yields of such fish catches are virtually negligible. Extensive fish kills, Nile perch, loss of habitat and overfishing have caused many fisheries to collapse and many protein sources to be unavailable at the market for local consumption. Few fisheries, though, have been able to make the switch to catching

8056-497: The main livelihood for people in the region. With four Great Lakes on its borders, Uganda ranks as one of the world's largest producers of freshwater fish. The climate and rich volcanic soils in the highlands also sustain intensely cultivated croplands. The economies of the Great Lakes region states have different structures and are at various stages of development. The GDP real growth rate ranges from 1.8 percent in Burundi to 4.4 in

8162-455: The native Lake Victoria sardine (30 percent). Because of its small size, the abundant open-water Lake Victoria sardine only supported minor fisheries until the decline of other natives. At the peak in the early 1990s, 500,000 tonnes (490,000 long tons; 550,000 short tons) of Nile perch were landed annually in Lake Victoria, but this has declined significantly in later years. A number of environmental issues are associated with Lake Victoria and

8268-418: The new builders mostly foreign or corrupt county officials put buildings that are over-priced for the town. In the past four to five years, a piece of 50 by 100 ft land went for $ 2500, today (2015), the same piece of land goes for $ 3500. The price for an acre is $ 12000. The rents have also increased as a one-bedroom house that used to be for $ 35 per month is now $ 50, while two bedroom house used to be $ 50 but

8374-462: The oxygen levels in the deeper layer of water are being depleted. Without oxygen, any aerobic life (such as fish) cannot exist in the deeper parts of the lake, forcing all life to exist within a narrow range of depth. In this way, the Nile perch has degraded the diverse and thriving ecosystem that was once Lake Victoria. The abundance of aquatic life is not the only dependent of the lake: more than thirty million people in Tanzania, Kenya and Uganda rely on

8480-539: The plants. Heavy winds and rains along with their subsequent waves may have also damaged the plants during this same time frame. The plants may not have been destroyed, instead merely moved to another location. Additionally, the water quality, nutrient supply, temperature, and other environmental factors could have played a role. Overall, the timing of the decline could be linked to all of these factors and perhaps together, in combination, they were more effective than any one deterrent would have been by itself. The water hyacinth

8586-570: The principal source of the longest branch of the Nile. However, the most distal source of the Nile Basin, and therefore the ultimate source of the Nile , is more often considered to be one of the tributary rivers of the Kagera River (the exact tributary remains undetermined), and which originates in either Rwanda or Burundi . The uppermost section of the Nile is generally known as the Victoria Nile until it reaches Lake Albert . Although it

8692-576: The region dried out, as happened to Lake Victoria about 15,000 years ago. In recent history only Lake Kyoga was easily accessible to Victoria cichlids, as further downstream movement by the Victoria Nile (to Lake Albert) is prevented by a series of waterfalls, notably Murchison . In contrast, the Owen Falls (now flooded by a dam ) between Victoria and Kyoga were essentially a series of rapids that did not effectively block fish movements between

8798-401: The region reducing the absorption of polluting chemicals and deteriorating the water quality. As of 2016, an environmental data repository exists for Lake Victoria. The repository contains shoreline, bathymetry, pollution, temperature, wind vector, and other important data for both the lake and the wider Basin. The first recorded information about Lake Victoria comes from Arab traders plying

8904-595: The region, notably Kyoga , Edward – George , Albert, and Kivu . Most of these lakes are relatively shallow (like Victoria) and part of the present-day upper Nile basin. The exception is Lake Kivu, which is part of the present-day Congo River basin , but is believed to have been connected to Lakes Edward and Victoria by rivers until the uplifting of parts of the East African Rift . This deep lake may have functioned as an "evolutionary reservoir" for this haplochromine group in periods where other shallower lakes in

9010-473: The region: Tanzania, Kenya, Uganda, Rwanda, and the Democratic Republic of the Congo. Because of its high population—estimated to be 107 million people —and the agricultural surplus in the region, the area became organized into a number of small states. The most powerful of these monarchies were Buganda , Bunyoro , Karagwe , Rwanda, and Burundi. Being the long-sought source of the Nile and

9116-432: The remaining species are seriously threatened and additional extinctions are possible. Some species have survived in nearby small satellite lakes, have survived in refugias among rocks or papyrus sedges (protecting them from the Nile perch), or have adapted to the human-induced changes in the lake itself. Such adaptions include a larger gill area (adaption for oxygen-poor water), changes in the feeding apparatus, changes to

9222-478: The separation of two tectonic plates , often accompanied by a graben , or trough, in which lake water can collect. This rift began when East Africa, impelled by currents in the mantle , began separating from the rest of Africa, moving to the northeast. The basins that resulted from the geological uplifts filled with water that now flowed north. Lake Victoria is not actually within the Rift Valley. It occupies

9328-421: The spiny eel Mastacembelus frenatus , elephantfish ( Gnathonemus , Hippopotamyrus , Marcusenius , Mormyrus , Petrocephalus , and Pollimyrus ), the climbing gourami Ctenopoma muriei and marbled lungfish ( Protopterus aethiopicus ). At a genus level, most of these are widespread in Africa, but the very rare Xenobarbus and Xenoclarias are endemic to the lake, and the common Rastrineobola

9434-513: The stock in 1962–63. The origin of the first Victoria introductions in the 1950s is not entirely clear and indisputable evidence is lacking. Uganda Game and Fisheries Department (UGFD) officials denied that they were involved, but circumstantial evidence suggests otherwise and local Africans employed by UGFD have said that they introduced the species in 1954–55 under the directive of senior officials. UGFD officials argued that Nile perch must have spread to Lake Victoria by themselves by passing through

9540-643: The surface-choking water hyacinth and shore-clogging papyrus , are problems. Water hyacinth have thus far affected only Lake Victoria. Until 12 million years ago, the bountiful waters of the equatorial plateau either flowed west into the Congo River system or east to the Indian Ocean . This was changed by the formation of the Great Rift Valley. A rift is a weak place in Earth's crust due to

9646-414: The town engaged in mission activities as well as gold mining at Macalder Mines. Migori holds a special place geographically because of its close proximity to Uganda via Lake Victoria , through Migingo Island and its land and lake border with Tanzania at Isebania, Kehancha , Suba West at Kopanga and Kogaja Villages and Muhuru Bay . There are no records for the population of the municipality arising from

9752-546: The town had a population of approximately 100,000 people. Migori is the second most viable urban center in Luo Nyanza after Kisumu city . However, it is the third largest town in former Nyanza province after Kisumu and Kisii. As compared to most Nyanza towns, Migori is unique because of its multi-ethnic makeup consisting of Dholuo-speaking people , Abasuba community, Abagusii, Abaluhya, Kuria, Indians, Arabs, and Somali people. Increasingly, there are also westerners living in

9858-454: The town has changed gradually to become the second most vibrant and bustling economic hub in the entire Luo Nyanza after Kisumu City and third after Kisii Town in the entire Nyanza province. Today, the Migori county headquarters is largely cosmopolitan with the influx of population from across the country due to the emerging employment and business opportunities. With the neighbouring Kisii county's lack of adequate land for expansion, Migori town

9964-412: The town. There is a National cereals board depot. Some common trees include Bondo ( Euphorbiacandelabrum ), Ochwoga ( Carissa edulis ), Mukinduri ( Croton megalocarpus ), Ngow ( Ficus nataliensis ), Onera ( Terminalia brownii ), Toona does well in the area but most trees are multi-branched, which may indicate bud borer trouble. Terminalia catappa , Cypress (a Cupressus lusitanica variant) does well in

10070-408: The two lakes. The Victoria haplochromines are distinctly sexually dimorphic (males relatively brightly colored; females dull), and their ecology is extremely diverse, falling into at least 16 groups, including detritivores , zooplanktivores , insectivores , prawn-eaters, molluscivores and piscivores . As a result of predation by the introduced Nile perch , eutrophication and other changes to

10176-457: The unfortunate skirmishes of 2007 left many of the Kikuyus traumatised). The language of business is Kiswahili, which shows the big difference with other Luo-dominated towns. The Church and Mosque life is very vibrant and at times very loud but this is expected to change with the new Noise laws introduced by Nema. As of December 2015, nothing has been done to curb the noise. The call to prayer in

10282-420: The upper Nile basin. Lake Victoria formerly was very rich in fish, including many endemics, but a high percentage of these became extinct since the 1940s. The main group in Lake Victoria is the haplochromine cichlids ( Haplochromis sensu lato ) with more than 500 species, almost all endemic, and including an estimated 300 that still are undescribed . This is far more species of fish than any other lake in

10388-752: The water column, and even out of the lake via predation by humans and terrestrial animals. The removal of Haplochromis , however, may have contributed to the increasing frequency of algal blooms , which may in turn be responsible for mass fish kills . The non-cichlid native fish include African tetras ( Brycinus ), cyprinids ( Enteromius , Garra , Labeo , Labeobarbus , Rastrineobola and Xenobarbus ), airbreathing catfish ( Clariallabes , Clarias and Xenoclarias ), bagrid catfish ( Bagrus ), loach catfish ( Amphilius and Zaireichthys ), silver butter catfish ( Schilbe intermedius ), Synodontis squeaker catfish, Nothobranchius killifish, poeciliids ( Aplocheilichthys and Micropanchax ),

10494-450: The watershed triple point between the rivers Nile, Congo and Zambezi, the region had long been of interest to Europeans. The first Europeans to arrive in the region in any numbers were Christian missionaries who had limited success in converting the locals, but did open the region to later colonization. Increased contact with the rest of the world led to a series of devastating epidemics affecting both humans and livestock. While seen as

10600-403: The weir and reservoir to replace it with an artificial barrage to control the level of the lake and reduce the gradual erosion of the rock weir. A standard for mimicking the old rate of outflow called the "agreed curve" was established, setting the maximum flow rate at 300 to 1,700 cubic metres per second (392–2,224 cu yd /sec) depending on the lake's water level. In 2002, Uganda completed

10706-752: The western side flowing into the Congo River basin and streams on the eastern side flowing to the Indian Ocean. As the East African Rift System formed, the eastern wall of the Albertine Rift (or Western Rift) rose, gradually reversing the drainage towards what is now Lake Victoria. The opening of the main East African Rift and the Albertine Rift downwarped the area between them as the rift walls rose, creating

10812-425: The world, except Lake Malawi . These are the result of a rapid adaptive radiation in the last circa 15,000 years. Their extraordinary diversity and speed of evolution have been the subjects for many scientists studying the forces that drive the richness of life everywhere. The Victoria haplochromines are part of an older group of more than 700 closely related species, also including those of several smaller lakes in

10918-428: Was collected in 1955 and it is unknown if it was in or near the lake) and P. busungwe only at Busungwe Island in the northwestern part of the lake. The latter likely is the smallest African freshwater crab with a carapace width up to about 1.6 cm (0.6 in), although P. kantsyore of Kagera River , and Platythelphusa maculata and P. polita of Lake Tanganyika are almost as small. The only shrimp/prawn

11024-473: Was constructed in Kisumu County in 2013. In addition to the biogas it produces, its by-product can be used as fertilizer . Other factors which may have contributed to the decline of the water hyacinth in Lake Victoria include varying weather patterns, such as El Niño during the last few months of 1997 and first six months of 1998 bringing with it higher levels of water in the lake and thus dislodging

11130-568: Was found in 1972. It was originally thought to be Homo habilis , but some anthropologists have assigned it to a new species, Homo rudolfensis , named after the lake (previously known as Lake Rudolf). In 1984, the Turkana Boy , a nearly complete skeleton of a Homo erectus boy was discovered. In 1999, a 3,500,000-year-old skull was discovered there, named Kenyanthropus platyops , which means "flat-faced man of Kenya". Fishing—primarily of tilapia species but also of Nile perch —provides

11236-576: Was the site of a commercial passenger aircraft crash. Precision Air Flight 494 an ATR 42–500 carrying 39 passengers and four crew, crashed while approaching Bukoba Airport , resulting in 19 fatalities. African Great Lakes Countries in the area which are bounded by the lakes of the Great Lakes region include Burundi , the Democratic Republic of the Congo , Ethiopia , Kenya , Malawi , Mozambique , Rwanda , Zambia , Tanzania , and Uganda . The following are included on most lists of

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