Caudal fins is heterocercal in bony fish

Options

A. Solea
B. Anabas
C. Anguilla
D. Exocoetus

Answer

To determine which fish has a heterocercal caudal fin among the given options, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Caudal Fins**:
- Caudal fins can be classified into two main types: heterocercal and homocercal.
- **Heterocercal fins** have lobes that are unequal in size.
- **Homocercal fins** have lobes that are equal in size.

2. **Identify the Fish Types**:
- The options provided are: Solia, Anabas, Anguila, and Exocoitus.
- We need to identify which of these has a heterocercal caudal fin.

3. **Analyze Each Option**:
- **Solia**: This fish has a homocercal fin.
- **Anabas**: This fish also has a homocercal fin.
- **Anguila**: This fish is known to have a homocercal fin.
- **Exocoitus**: This fish is known to have a heterocercal fin.

4. **Conclusion**:
- Based on the analysis, the only fish among the options that has a heterocercal caudal fin is **Exocoitus**.

5. **Final Answer**:
- Therefore, the correct answer is **option D: Exocoitus**.