Anadromous fishes move

Options

A. From estuary to sea
B. From river to sea
C. From sea to estuary
D. From fresh water to sea

Answer

### Step-by-Step Solution:

1. **Understanding Anadromous Fishes**: Anadromous fishes are species that are born in freshwater, migrate to saltwater for most of their adult life, and return to freshwater to spawn.

2. **Life Cycle of Anadromous Fishes**:
- **Birth**: Anadromous fishes, such as Salmon and Sturgeon, are born in freshwater environments.
- **Migration to Saltwater**: After hatching, they migrate to saltwater where they spend the majority of their lives.
- **Spawning**: When it is time for reproduction, they return to freshwater to spawn.

3. **Analyzing the Options**:
- **Option 1: From estuary to sea**: This is incorrect as anadromous fishes do not primarily move from estuaries to the sea.
- **Option 2: From river to sea**: This is also incorrect because they do not move from rivers to the sea for their life cycle.
- **Option 3: From sea to estuary**: This is correct. Anadromous fishes move from the sea to freshwater (which can be considered as estuaries or rivers) for spawning.
- **Option 4: From freshwater to sea**: This is incorrect as they do not primarily move from freshwater to the sea for their life cycle.

4. **Conclusion**: The correct movement of anadromous fishes is from the sea to freshwater (estuary) for spawning.

### Final Answer:
Anadromous fishes move from the sea to freshwater (estuary) for spawning.

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