Which of the following is not an example of fish?

Options

A. Scoliodon
B. Carcharodon
C. Ichthyophis
D. Clarias

Answer

To determine which of the following is not an example of fish, we need to analyze each option provided:

1. **Scoliodon**: This is commonly known as the dogfish. It belongs to the class Chondrichthyes, which includes cartilaginous fish. Therefore, Scoliodon is indeed a fish.

2. **Carcharodon**: This is known as the great white shark. Like Scoliodon, it also belongs to the class Chondrichthyes. Hence, Carcharodon is also a fish.

3. **Ichthyophis**: This is where we find the distinction. Ichthyophis is known as a limbless amphibian. It does not belong to the class of fish; instead, it is classified under amphibians. Therefore, Ichthyophis is not a fish.

4. **Clarias**: This is commonly referred to as catfish and belongs to the class Actinopterygii, which includes bony fish. Thus, Clarias is a fish.

Based on this analysis, the answer to the question "Which of the following is not an example of fish?" is **Ichthyophis**.

### Step-by-Step Solution:
1. Identify the first option: Scoliodon (dogfish) - belongs to Chondrichthyes (is a fish).
2. Identify the second option: Carcharodon (great white shark) - belongs to Chondrichthyes (is a fish).
3. Identify the third option: Ichthyophis - classified as a limbless amphibian (is NOT a fish).
4. Identify the fourth option: Clarias (catfish) - belongs to Actinopterygii (is a fish).
5. Conclude that the option which is not an example of fish is Ichthyophis.