Heterocercal tail is found in

Options

A. Cartilaginous fishes
B. Bony fishes
C. Whale
D. Amphibians

Answer

### Step-by-Step Solution:

1. **Understanding Heterocercal Tail**:
- A heterocercal tail is characterized by having two lobes of unequal size. The larger lobe contains the vertebral column, while the smaller lobe does not.

2. **Identifying Types of Fish**:
- There are different types of fish, primarily categorized into cartilaginous fish and bony fish.
- **Cartilaginous Fish**: These fish have a skeleton made of cartilage instead of bones. Examples include sharks and rays.
- **Bony Fish**: These fish have a skeleton made of bones. They typically have a homocercal tail, which means both lobes are equal in size.

3. **Analyzing the Options**:
- The options provided include:
- A) Cartilaginous fish
- B) Bony fish
- C) Whale
- D) Amphibians
- Cartilaginous fish are known for having a heterocercal tail.

4. **Conclusion**:
- Based on the characteristics of the heterocercal tail and the types of fish, the correct answer is **A) Cartilaginous fish**.