Potamodromous fishes migrate from

Options

A. Fresh to fresh water
B. Fresh to marine water
C. Marine to fresh water
D. Marine to marine water

Answer

To answer the question "Potamodromous fishes migrate from?", we will follow these steps:

### Step 1: Define Potamodromous Fishes
Potamodromous fishes are those that migrate within freshwater environments. This type of migration is specifically characterized by movements that occur entirely in freshwater bodies.

### Step 2: Understand Potamodromous Migration
Potamodromous migration typically occurs for reasons such as mating, breeding, or finding suitable habitats within freshwater systems.

### Step 3: Identify Examples of Potamodromous Fishes
An example of a potamodromous fish is the Pacific salmon. These fish migrate within freshwater rivers and streams, particularly during their breeding season.

### Step 4: Analyze the Options Given
1. Fresh to freshwater: This aligns with the definition of potamodromous migration.
2. Fresh to marine water: This describes catadromous migration, where fish move from freshwater to saltwater.
3. Marine to freshwater: This describes anadromous migration, where fish move from saltwater to freshwater.
4. Marine to marine water: This describes oceanodromous migration, where fish migrate within marine environments.

### Step 5: Conclusion
Based on the definitions and examples discussed, the correct answer to the question is that potamodromous fishes migrate from freshwater to freshwater.

### Final Answer
**Potamodromous fishes migrate from freshwater to freshwater.**

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