I disagree. It is abstract, there’s nothing at all about semi tones that immediately describes a shark; but it’s become a common and well understood theme that one can conjure and associate the images alongside: to me the very definition of abstraction.
Almost all thematic music, tone poems and the like are abstract. The real things they are depicting in no way sound like the image they conjure. Non abstract music is rarer - where the sound imitates the real sound; e.g. birdsong imitation, doors banging via drums, the literal use of cannon in orchestral pieces like in the 1812.