How do you get blode mermaid in pirates of the Caribbean?

In "Pirates of the Caribbean: On Stranger Tides," the blonde mermaid, named Syrena, is a central character. To encounter her, players typically need to progress through the storyline where mermaids feature prominently, particularly in the scenes involving the Fountain of Youth. However, if you're referring to a specific game or additional content, please specify for more tailored guidance.