What fish has the largest scales?

Fish scales:

1. A small rigid plate that grows out of the skin of the fish is known as fish scale.
2. Scales give protection from the environment and from predators and also help in locomotion.
3. Scales are different in size, structure, and shape.
4. There are four types of fish scales: Cycloid scale, Ctenoid scales, Placoid scales and Ganoid scales.

Arapaima:

1. In the rainforest of the Amazon lives the largest scaled freshwater fish on the planet, the Arapaima.
2. Arapaima, a genus of fish under the Arapaimidae family, is known to have the largest scales among fish.