Which of the following is not an invasive alien plant species in India ?

Options

A. Parthenium
B. Eicchornia
C. Lantana
D. Clarias

Answer

To solve the question "Which of the following is not an invasive alien plant species in India?" we will analyze each of the given options one by one.

### Step-by-Step Solution:

1. **Understanding Invasive Alien Species**:
- Invasive alien species are non-native organisms that are introduced into a new ecosystem, where they compete with native species for resources such as food and habitat. They can threaten the existence of native species.

2. **Analyzing the Options**:
- **Option A: Parthenium**:
- Parthenium hysterophorus is known to have been introduced to India as a contaminant with wheat. It is recognized as an invasive alien species because it competes aggressively with native plants.
- **Option B: Echornia**:
- Eichhornia crassipes, commonly known as water hyacinth, was introduced for its ornamental value. However, it has become invasive, covering water bodies and disrupting local ecosystems.
- **Option C: Lantana**:
- Lantana camara is native to the tropical regions of America and Africa. It has been introduced to India and is considered invasive due to its rapid spread and negative impact on native flora.
- **Option D: Clarias**:
- Clarias is a genus of catfishes (family Clariidae) and is not a plant species. It is not considered an invasive alien plant species.

3. **Conclusion**:
- Among the options provided, Clarias is the only one that is not an invasive alien plant species in India. Therefore, the correct answer is **Clarias**.

### Final Answer:
The option that is not an invasive alien plant species in India is **Clarias**.