Pectoral fins are enlarged in

Options

A. Hippocampus
B. Exocoetus
C. Coccosteus
D. Scoliodon

Answer

To solve the question "Pectoral fins are enlarged in," we will analyze each option provided to determine which fish has enlarged pectoral fins.

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify which of the given fish has enlarged pectoral fins.

2. **Evaluate the First Option - Hippocampus**:
- Commonly known as the seahorse, Hippocampus is a small marine fish.
- The pectoral fins in seahorses are not enlarged; they are relatively small and not used for significant movement.
- **Conclusion**: This option is incorrect.

3. **Evaluate the Second Option - Exocetus**:
- Commonly known as the flying fish, Exocetus is known for its ability to glide above the water surface.
- This fish has enlarged pectoral fins that help it glide and take large jumps out of the water.
- **Conclusion**: This option is correct.

4. **Evaluate the Third Option - Cococetus**:
- Cococetus is an extinct fish.
- Since it is extinct, we cannot consider it for having enlarged pectoral fins in the context of the question.
- **Conclusion**: This option is incorrect.

5. **Evaluate the Fourth Option - Scoluron**:
- Commonly known as dogfish, Scoluron is recognized for its keen sense of smell.
- The pectoral fins of dogfish are not notably enlarged compared to other fish.
- **Conclusion**: This option is incorrect.

6. **Final Conclusion**: After evaluating all options, the fish with enlarged pectoral fins is **Exocetus**.

### Final Answer:
The correct answer is **Exocetus**.

---