Does mermaid evolution come with buoyancy control?

I must admit this legendary or mythical creature is really fascinating and I am talking about the half fish half woman.

I know most fish have the ability to control buoyancy as they can easily move around in the water without having to tread water; they've got something called a swim bladder.

I am wondering if the presence of a swim bladder could affect the agility of mermaids underwater? Or did their ancestor already abandon buoyancy control over waste processing systems, much like us?

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Does mermaid evolution come with buoyancy control?

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