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But the Nile perch weren't the only problem for the cichlids in Lake Victoria. There were many thin layers of blue-green algae scattered across the lake.
As the algae grew in Lake Victoria, the water became murkier. The cichlids who did survive couldn't see well enough to find mates, therefore they couldn't reproduce.
Despite these problems, some organisms thrived such as prawns, snails, and midges- which need little oxygen.
To add on, the rotting algae caused the water to pollute. It also caused the cichlids and many other fish to suffocate. By the early 1990's, about 60% of Lake Victoria's water lacked oxygen all year.
And there is yet again another enemy in the ecosystem of Lake Victoria. This plant, called a water hyacinth, floats down Kagera River into the lake. It is native to the Amazon Basin and was introduced to Africa in he 1800's.
The reason why the water hyacinth was bad is because the hyacinth makes breeding harder by blocking light and removing oxygen from the water.
And that is the story of Lake Victoria.
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