Mermaid
From Memory Alpha, the free Star Trek reference
A mermaid was a being that was half-humanoid, half-fish who lived under the sea. (DS9: "Melora")
Mermaids lived on the planet Golos Prime in the Clevari system. Q, Junior suggested taking a dip with these mermaids, during a brief visit to their system in 2377. (VOY: "Q2")
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[edit] Background
A deleted scene from ENT: "Fallen Hero" revealed that diving for tourists on Risa was guided by genetically enhanced females, capable of breathing underwater. When Travis Mayweather revealed this to Malcolm Reed, he immediately thought "mermaids."
