Arapaima

The arapaima is a river fish that appears in late summer. It will only appear between the hours of 4pm and 9am. It is a very rare fish, and that is why this fish is the second most expensive river fish, after the Dorado and tied with the Arowana. Its shadow is huge, and likewise it is the largest river fish.

Further Information
The arapaima is the largest freshwater fish in the world and it can be found in the Amazon River which is in the continent of South America. It is sometimes called the pirarucu or paiche.

Trivia
It is the last river fish in the in-game fish encyclopedia.