1. The tubercle is contrasted with placoid and ganoid scales.

2. The primary categories of fish scales are placoid, cosmoid, ganoid, cycloid and Ctenoid scales

3. PATIENTS: Patient 1 and 2 presented with unilateral decrease in visual acuity and yellowish placoid macular changes.

4. The body shape and structure of the trunk placoid scales indicate the ability to swim quickly.

5. Compare with ganoid and placoid ‘The body is covered with small Ctenoid scales that extend well onto the dorsal and anal fins.’