A Klabnian eel is an eel from Klabnia.

Q threatened to use his powers to turn Vash into a Klabnian eel in 2367. (TNG episode: "QPid")

In 2369, Odo commented that Quark was as slippery as a Klabnian eel when referring to how few convictions Odo had brought against him. (DS9 video game: Harbinger)

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