Even in the most biodiverse rainforest of the world, the pirarucu stands out: It can weigh up to 200 kilos (440 pounds), by far the largest of 2,300 known fish species in the Amazon. Not so long ago it nearly vanished from the Medio Jurua region as illegal and unsustainable fishing swept the lakes with large nets. Now something remarkable has happened. The fish has come back to the lakes of Medio Jurua thanks to sustainable fishing practice by riverine communities and Deni Indigenous people.

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