In the 1950s scientists stocked a giant fish to boost fishing: Decades later hundreds of native species had disappeared

Lake Victoria is located in East Africa, and it is shared by three countries, Tanzania (about 49% of the lake), Uganda (about 45%) and Kenya (about 6%).

It is the largest lake in the African continent by surface area and is one of the African Great Lakes. The lake lies near the Equator and serves as a major source of water for the Nile River.

The lake was famous for harboring over 300 to 500 species of unique, highly evolved cichlid fish found nowhere else on Earth.

In a drive to boost commercial fishing yields back in the 1950, the British colonial fisheries officials decided to introduce the Nile perch to the lake, a fish which can grow over 6 feet long and weigh up to 400 lbs, making it an ideal candidate for industrial fishing.

However, those behind the initiative failed to plan on the massive apex predator wreaking havoc with approximately 200 to 300 native cichlid species were eaten into extinction or driven to near-extinction within a few decades.

These native cichlids controlled the lake’s algae and organic detritus. Once they disappeared, massive algal blooms covered the water, leading to oxygen depletion and vast underwater “dead zones”.

Unlike native fish, which could be easily sun-dried, the oily Nile perch required smoking for preservation. Local processing triggered widespread deforestation around Lake Victoria’s shores as trees were cut down for firewood, causing heavy soil erosion into the lake.

While the Nile perch created a lucrative multi-million-dollar export market to European and Asian countries, it fundamentally decimated the local ecosystem and displaced traditional artisanal fishers across Kenya, Uganda, and Tanzania.

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