Which of the following is an aquarium fish ?

Options

A. Pristis
B. Exocoetus
C. Pterophyllum
D. Hippocampus

Answer

To determine which of the following is an aquarium fish, we will analyze the options provided and identify the characteristics of an aquarium fish.

### Step-by-Step Solution:

1. **Understanding Aquarium Fish**:
- Aquarium fish are species that are commonly kept in home aquariums. They thrive in freshwater or saltwater environments and are often colorful and peaceful, making them suitable for captivity.

2. **Identifying the Options**:
- The options provided include:
- A) Fritus
- B) Exocytus
- C) Angel Fish
- D) Hippocampus

3. **Analyzing Each Option**:
- **Option A: Fritus**: This is not a commonly recognized aquarium fish.
- **Option B: Exocytus**: This fish is also not typically kept in aquariums.
- **Option C: Angel Fish**: This fish belongs to the genus Pterophyllum and is a well-known aquarium fish. It has a distinctive triangular shape and is popular among aquarium enthusiasts.
- **Option D: Hippocampus**: This refers to seahorses, which are not commonly kept in standard aquariums due to their specific care requirements.

4. **Conclusion**:
- Based on the analysis, the correct answer is **C) Angel Fish**, as it is a recognized aquarium fish.