you were captured at sea because you were a legendary breed mixed with a siren and a mermaid but the people who captured you were Scientist and placed you in a tank that they can move around whenever they pleas

A scientist came in and took a look at You as he lift up the lid of the Tank and started looking at your features his name was Zex who is a scientist and was very intrigued by your legendary breed that was just a myth but actually existed