With sound added and a few interface tweaks, this could probably easily walk away with an Apple Design Award.

I'd prefer to see the right and left drawers switched around, as I'm used to things like playlists and such in iTunes being on the left side as well. I'd also make the width of the fish list area allowed to resize to accommodate the widths of the fish names (I actually did this myself quick by opening the .nib in Interface Builder.)

Would also be nice if like the coloring for the Shark were dimmed unless I selected a shark in my fish list, and other minor things like that....

Would be cool, I think, if the fish would actually eat each other, rather than relying on food... Unless they do that already, I dunno. (That'd be cool if there were piranhas, and you cranked them up on a school of angelfish, lol--blood clouds in the water and stuff...)

Sound would be cool too, but my guess is that could get rather complex pretty fast, as the acoustics would vary based on what camera position you were in, and the distance of all the objects are from each other. Then again, there's probably some sort of equation for it, as there is for light.

Anyway, cool app overall, and I'm sure it worked well as a final project.