Hippo Poop Causing Massive Fish Die-Offs in African Rivers

  • Yale researchers found that the 4,000 hippos that frequent Kenya’s Mara River leave behind 9.3 tons of excrement each day.
  • Excrement left behind can deplete river water of enough oxygen to keep fish alive.
  • As the feces decomposes in the river, ammonium and sulfide are produced, which can be toxic to marine life. 

Excrement from hippos frequenting watering holes along rivers in Africa often leads to fish die-offs, a new study says.

Researchers at Yale University’s Cary Institute of Ecosystem Studies studied hippopotamus populations and river health at Kenya’s Maasai Mara National Reserve.

They found that the 4,000 or so hippos that frequent the reserve’s Mara River leave behind 9.3 tons of excrement each day, which robs the waters of oxygen. In addition, as the feces…

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