Question

What are cycloid scales made of?

Answer 1

Cycloid scales:

1. Cycloid scales are a collagenous layer of ganoid (hard or bony) or cosmoid scales (comprising a cosmine layer).
2. They have two distinct regions made from the outer bony layer comprising calcium-based salts, while the inner fibrous layer is made up of collagen.
3. These scales are smooth-edged scales.
4. They are found in fishes such as salmon, carp, etc.