Swim bladder in fish is an organ for___________.

Explanation

**Step-by-Step Solution:**

1. **Identify the Organ**: The swim bladder is an organ found in certain types of fish, specifically bony fishes.

2. **Understand the Function**: The primary function of the swim bladder is to provide buoyancy to the fish.

3. **Define Buoyancy**: Buoyancy is the ability of an object to float in water or air. In the case of fish, it allows them to maintain their position in the water column without expending energy.

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