A major current critical fallacy is to assume that the display of an object, which is an intrinsic part of an experience, in any way interprets a theme or deals with the issue of that experience.
A dead shark displayed as an art work does not tell us anything about death (or for that matter about sharks) that we would not know through the ordinary experience of seeing a dead shark, completely regardless of its art context.
Damien takes a more friendly approach by Charles Thomson
A dead shark in a tank of formaldehyde does not address the issue of death: it is just dead. The only possible comment that it makes is that to be dead is like being in a contemporary art gallery.