He cited the example of the piranha, a fish that paiche prey on but that are still found in the rivers of northern Bolivia.

Source: https://southafricatoday.net/environment/a-freshwater-giant-is-a-boon-to-bolivian-fishers-but-an-unknown-for-native-species/

He explained to me that the water was red, not because of the reddish clay, but because of the piranha that were lying in wait to eat another small child like myself.

Source: https://710keel.com/ixp/182/p/top-10-things-that-give-people-from-louisiana-trust-issues/

The pacu fish is a cousin of the piranha, fwiw.

Source: https://www.buzzfeed.com/crystalro/terrifying-things-i-learned-november-2023