Question

Xanthophores impart which colour in fishes?

• A. Red
• B. Brown
• C. Yellow
• D. Black

Hint:

Match the chromatophore prefixes:
Melano- $\rightarrow$ Black.
Erythro- $\rightarrow$ Red.
Xantho- $\rightarrow$ Yellow.
Irido- $\rightarrow$ Silvery/Reflective.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
The body coloration of fishes is produced by specialized pigment-containing or light-reflecting cells located in the dermis, known as chromatophores.

Step 2: Detailed Explanation:
Different types of chromatophores contain different pigments that absorb or reflect specific wavelengths of light:
Melanophores contain melanin pigments, producing black or dark brown colors.
Erythrophores contain pteridines and carotenoids that produce red colors.
Iridophores contain reflective purine crystals (like guanine) that produce iridescent, silvery, or metallic colors.
Xanthophores contain carotenoid and pteridine pigments that selectively absorb blue-violet light and reflect yellow or yellow-orange light.
Thus, xanthophores are primarily responsible for imparting yellow coloration to the skin and scales of fishes.
Therefore, the correct color is yellow.

Step 3: Final Answer:
Xanthophores impart Yellow colour in fishes.