It’s not all unicorns and rainbows when it comes to Arapaima.

At first, Guillermo was catching native fish, such as the various kinds of catfish that inhabit the river. But then a giant freshwater fish arrived, known locally as paiche or Arapaima Gigas, to give it its scientific name.

It is generally believed its arrival resulted from a breach of a paiche fish farm in Peru, where the fish are native. From there, they spread into Bolivia’s rivers.