Which of the following fishes has ctenoid scales?

Correct option is D

Correct Answer: (d) Anabas
Explanation:
→ Anabas (climbing perch) possesses ctenoid scales characterized by tiny comb-like projections (cteni) on the posterior margin.
→ These scales provide better hydrodynamic control and body rigidity.
→ Ctenoid scales are typical of spiny-rayed fishes.
Information Booster:
→ Provide improved friction against water for maneuverability.
→ Common in Perciformes.
→ Helps distinguish advanced teleosts from primitive ones.
Additional Information (Other Options):
(a) Acipenser – ganoid scales.
(b) Mrigal and (c) Catla – cycloid scales.