A sleark was a type of animal lifeform.
History and specifics[]
The guts of the sleark have been known to be diced and served as food for humanoids.
In the year 2376 in the First Splinter timeline, as Quark considered his attractiveness as a suitor to Ro Laren, he decided he wasn't quite diced sleark gut, and should have a chance. (DS9 novel: Unity)