A larvaevorous fish is

Options

A. Gambusia
B. Solea
C. Anabas
D. Diodon

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Larvivorous":**
- A larvivorous fish is defined as a fish that primarily feeds on the larvae of other organisms. This characteristic is important in identifying the correct answer.

2. **Analyzing the Options:**
- We have four options to consider: Gambusia, Sonia, Anubis, and Diodon. We need to evaluate each option to determine which one is larvivorous.

3. **Evaluating Option 1 - Gambusia:**
- Gambusia, commonly known as mosquito fish, is known for its diet that includes the larvae of mosquitoes, particularly the Anopheles mosquito. This makes it a larvivorous fish.

4. **Evaluating Option 2 - Sonia:**
- Sonia does not have a well-known association with feeding on larvae. There is limited information available about this option in the context of larvivorous behavior.

5. **Evaluating Option 3 - Anubis:**
- Anubis is a type of fish that is carnivorous, meaning it primarily eats other fish or larger prey rather than larvae. Thus, it does not fit the definition of a larvivorous fish.

6. **Evaluating Option 4 - Diodon:**
- Diodon, commonly known as the blowfish, is also not known for feeding on larvae. It primarily feeds on invertebrates and other fish, making it an incorrect option.

7. **Conclusion:**
- After evaluating all options, it is clear that the only fish that fits the description of a larvivorous fish is Gambusia. Therefore, the correct answer is option 1: Gambusia.

**Final Answer:** Gambusia (Option 1)

---