Mekong Giant Catfish Pangasianodon gigas So, this guy's not as cute as a fox or a primate, but that doesn't mean it deserves to disappear from Planet Earth. The Mekong Giant Catfish is one of the largest freshwater fish in the world. It can be as long as 3 meters and weigh more than 300 kilograms. It makes its home in the lower Mekong River and heads upstream into Cambodia to reproduce. It’s hard to know how many are left.
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