Where are cycloid scales found?

Fish scales:

1. A small rigid plate that grows out of the skin of the fish is known as a 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 scales, Ctenoid scales, Placoid scales and Ganoid scales.

Cycloid Scales:

1. Cycloid scales are round and flexible structures which are present on the surface of bony fishes.
2. Cycloid scales have an outer layer of calcium and an inner layer made of connective tissues.
3. Cycloid scales are the inner layer of ganoid scales.
4. Example: Trout, Herring, Carp, etc.