Choose the odd one w.r.t. Alein species invasion

Options

A. Nile perch
B. Water hyacinth
C. Clarias gariepinus
D. Cichild fish

Answer

**Step-by-Step Solution:**

1. **Understand the Concept of Alien Species Invasion:**
- Alien species, also known as exotic species, are organisms that are introduced to a new environment where they do not naturally occur. These species can disrupt local ecosystems, often outcompeting native species for resources.

2. **Analyze the Options:**
- The options provided are:
1. Nile Perch
2. Water Hyacinth
3. Clarias (a type of catfish)
4. Cichlid Fish

3. **Evaluate Each Option:**
- **Nile Perch:** This species was introduced to Lake Victoria, where it led to the extinction of many native Cichlid Fish. This is a clear example of alien species invasion.
- **Water Hyacinth:** This plant was brought from America to India and has become an invasive species, causing ecological damage. This is also an example of alien species invasion.
- **Clarias:** This catfish was introduced from outside and has outcompeted native species, making it another example of alien species invasion.
- **Cichlid Fish:** This fish is native to Lake Victoria and was not introduced from another region. Instead, it became extinct due to the introduction of the Nile Perch.

4. **Identify the Odd One Out:**
- The Cichlid Fish is the only option that is not an example of alien species invasion. It is a native species that was affected by the introduction of an alien species (Nile Perch).

5. **Conclusion:**
- Therefore, the odd one out with respect to alien species invasion is **Cichlid Fish** (Option 4).