a recent hollywood film may help you

Identify

Answer: Piranha

The piranha is an omnivorous freshwater fish that inhabits South American rivers.They are known for their sharp teeth and a voracious appetite for meat.

today a fish

Which famous aquarium species?

Answer: Super red arowana commonly called as Asian  Arowana

Native to Southeast Asia, Asian arowanas inhabit blackwater rivers, slow-moving waters flowing through forested swamps and wetlands.Like all members of Osteoglossidae, Asian arowanas are highly adapted to fresh water and are incapable of surviving in the ocean.This popular aquarium fish have special cultural significance in areas influenced by Chinese culture.It is an endangered species.