Age of fishes is

Options

A. Permian Period
B. Silurian Period
C. Devonian Period
D. Ordovician Period

Answer

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking about which period in geological history is referred to as the "age of fishes."

2. **Identify the Relevant Era**: The Paleozoic era is known as the era of ancient life and is divided into six periods.

3. **Focus on the Devonian Period**: Among these periods, the Devonian period is specifically noted for the diversification and dominance of fishes. This period is often referred to as the "age of fishes."

4. **Time Frame of the Devonian Period**: The Devonian period occurred approximately between 410 to 360 million years ago.

5. **Evaluate the Options**:
- Hermian period: Incorrect
- Silurian period: Incorrect
- Devonian period: Correct
- Ordovician period: Incorrect

6. **Conclusion**: The correct answer to the question "Age of fishes is" is the Devonian period.

### Final Answer:
The age of fishes is referred to as the Devonian period.

---