Arapaima, also known as pirarucu, is a freshwater fish species native to the Amazon basin in South America. They can grow to be quite large, with some individuals reaching lengths of up to 9 feet and weights of over 400 pounds.

Fly fishing for arapaima can be challenging due to their size and strength, but also rewarding as they are considered a prized game fish. The best time to fish for arapaima is during the rainy season (December to May), when they are more active.

The best flies to use when fly fishing for arapaima are large streamers and poppers, as these mimic the small fish, crustaceans, and insects that arapaima feed on. Arapaima is also known to be surface feeders, so using a floating fly line will be effective.

Because of their size, fighting an arapaima on a fly rod can be quite a workout, so it is essential to be in good physical shape and to have the proper equipment.

In addition, it should be noted that arapaima is a vulnerable species, and their population has been declining due to overfishing and habitat destruction. It is important to consider the conservation status of the species before targeting them. 

You can contact Wild on the Fly Adventure Travel for more information.