Which one has heterocercal tail

Options

A. Dipnoi
B. Bony fish
C. Cartilaginous fish
D. All the above

Answer

To determine which type of fish has a heterocercal tail, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Heterocercal Tail**:
- A heterocercal tail is characterized by two lobes that are unequal in size. The dorsal lobe (the upper lobe) is longer than the ventral lobe (the lower lobe).

2. **Analyze the Options**:
- **Option 1: Dipnoid (Lungfish)**:
- Dipnoid fish have a homocercal tail, where both lobes are equal in size. Therefore, this option is incorrect.
- **Option 2: Bony Fish**:
- Bony fish also typically possess a homocercal tail, meaning both lobes are equal in size. Thus, this option is also incorrect.
- **Option 3: Cartilaginous Fish**:
- Cartilaginous fish, such as sharks and rays, exhibit a heterocercal tail, where the dorsal lobe is longer than the ventral lobe. This option is correct.
- **Option 4: All of the Above**:
- Since only cartilaginous fish have a heterocercal tail, this option is incorrect.

3. **Conclusion**:
- The only correct answer is **Option 3: Cartilaginous Fish**, as they are the ones that possess a heterocercal tail.

### Final Answer:
**Cartilaginous Fish**

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