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Lake Mweru

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Lake Mweru is a significant freshwater lake in Africa. It sits on the border between Zambia and the Democratic Republic of the Congo. The lake forms a vital part of the Congo River system. It is located on the longest arm of Africa's second-longest river. Specifically, the lake lies between the Luapula River and the Luvua River segments. This positioning makes it the second-largest lake within the Congo drainage basin. It is situated west of the southern end of Lake Tanganyika. The name 'Mweru' is a common term for 'lake' in several Bantu languages.

Mweru-Luapula
Mweru-Luapula

The lake's water levels are maintained by a specific natural mechanism. The Luapula River enters from the south through wide, swampy deltas. These swamps, known as the Bangweulu Swamps, act as a regulator. They absorb annual floods and release the water slowly. This process prevents the lake from changing too much during wet seasons. At the north end, the Luvua River drains the lake. The Luvua flows northwesterly toward the Lualaba River and the Congo. Because the Luvua flows swiftly without much vegetation, it quickly offsets any rise in water levels. Consequently, the annual fluctuation in lake level is only about 1 meter.

Lake Mweru is a rift valley lake. It sits within the Lake Mweru-Luapula graben. This graben is a branch of the East African Rift. The physical landscape varies greatly between the two shores. The western shore in the DR Congo features a steep escarpment. This is a steep slope typical of rift valley lakes. This escarpment rises toward the Kundelungu Mountains. In contrast, the eastern shore is much less pronounced. The lake's depth also changes across its surface. It is shallow in the south and becomes deeper in the north. In the north-eastern section, two depressions reach a maximum depth of 80 meters.

Haplochromis moeruensis
Haplochromis moeruensis

History shows that Lake Mweru has long been a site for trade and exploration. Arab and Swahili traders used the lake for commerce involving ivory, copper, and slaves. They used Kilwa Island as a strategic base. They connected trade routes from Zanzibar to the Lunda, Luba, Yeke, or Kazembe kingdoms. Between 1796 and 1831, Portuguese explorers like Francisco de Lacerda visited the region. They sought treaties to secure trade routes between Mozambique and Angola. Later, the explorer David Livingstone visited in 1867. He referred to the lake as 'Moero.' His accounts of the slave trade helped rally international opposition to the practice.

European presence increased through various expeditions in the late 19th century. Alfred Sharpe visited in 1890, and the Stairs Expedition arrived in 1892. The Stairs Expedition was significant because it killed the Yeke king, Msiri. This event led to the Belgian King Leopold II taking control of Katanga. In 1891, Sharpe's officer established the first British colonial outpost at Chiengi. Over time, the lake was divided between colonial powers. The western shore became part of the Belgian Congo. The eastern shore became part of Northern Rhodesia, a British protectorate. Today, Zambia holds 58% of the lake waters, while the DR Congo holds 42%.

Mweru-Luapula
Mweru-Luapula

The fishing industry is a central part of the local economy and culture. Many fishing villages and seasonal camps dot the shores. The lake is famous for its longfin tilapia, known as 'pa-lay' in Chibemba. Other species include catfish, tigerfish, elephantfish, and sardine-like fish. One species of catfish can grow to 1 meter in length. In the 19th century, Greek fishermen from the Dodecanese islands settled in Kasenga. They pioneered commercial fishing using Greek-style boats. These boats originally used charcoal-fueled steam engines before switching to diesel. In 1950, it was estimated that 50 Greek boats caught 4,500 tonnes of fresh fish annually.

Haplochromis moeruensis
Haplochromis moeruensis

Modern times have brought changes to the lake's usage and population. While the Congolese side once developed faster, political crises and wars have affected its infrastructure. The Second Congo War from 1999 to 2003 caused significant hardship. This led many refugees to enter Zambia at Pweto. Meanwhile, the Zambian side has seen an increase in population and services. Many people moved to the lake shores to work in the fishery. This was especially true when workers left the Copperbelt mines in the 1980s and 1990s. Currently, the catch is estimated at 30,000 tonnes per year from about 4,500 small craft.

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File:Mweru-Luapula.jpg
Mweru-Luapula.jpg
File:Haplochromis moeruensis.gif
Haplochromis moeruensis.gif
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