A catadromous fish like Anguilla migrates from

Options

A. rivers to sea
B. rivers to estuary
C. sea to rivers
D. deep sea to surface waters.

Answer

**Step-by-Step Solution:**

1. **Understanding Catadromous Fish:**
- Catadromous fish are those that spend most of their adult lives in freshwater but migrate to the sea to spawn. This is a specific type of migration known as catadromous migration.

2. **Identifying the Migration Pattern:**
- In catadromous migration, the fish typically live in freshwater environments (like rivers) and return to the sea for breeding purposes.

3. **Examples of Catadromous Fish:**
- A well-known example of catadromous fish is the eel, particularly those in the genus Anguilla. These fish spend most of their lives in freshwater but migrate to the ocean to reproduce.

4. **Analyzing the Options:**
- The options provided are:
- A) River to Sea
- B) Rivers to Estuary
- C) Sea to Rivers
- D) Deep Sea to Surface Water
- Since catadromous fish migrate from freshwater to the sea, we need to identify which option correctly describes this movement.

5. **Evaluating Each Option:**
- A) River to Sea: This describes anadromous migration (like salmon), which is incorrect.
- B) Rivers to Estuary: This does not accurately describe catadromous migration.
- C) Sea to Rivers: This is incorrect as it describes the opposite of catadromous migration.
- D) Deep Sea to Surface Water: This option correctly describes the migration of catadromous fish, as they move from deeper marine environments to freshwater for spawning.

6. **Conclusion:**
- The correct answer is **Deep Sea to Surface Water** as it accurately represents the migration pattern of catadromous fish like Anguilla.

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