Which one is not a marine fish ?

Options

A. Pomfret
B. Sardine
C. Rohu
D. mackerel

Answer

**Step-by-Step Solution:**

1. **Identify the Options:**
- The question provides four options: pomfret, sardine, rohu, and mackerel.

2. **Understand the Types of Fish:**
- Marine fish are those that live in saltwater environments, such as oceans and seas.
- Freshwater fish live in freshwater environments like rivers, lakes, and ponds.

3. **Analyze Each Option:**
- **Pomfret:** A type of fish commonly found in marine environments.
- **Sardine:** Another fish that is predominantly found in marine waters.
- **Mackerel:** A fish species that is also found in marine environments.
- **Rohu:** A fish that is primarily found in freshwater environments.

4. **Determine the Correct Answer:**
- Since rohu is identified as a freshwater fish, it does not belong to the category of marine fish. Therefore, the correct answer is **rohu**.

5. **Conclusion:**
- The fish that is not a marine fish among the options given is **rohu**.

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