LOL,

peanut butter and jellyfish sandwich

That's a good question @ironshield...but I think you are right that they can't be Kosher because of that(no fins or scales).

I was also wondering about the vegan aspect too. They are invertebrates and they do not have brains, hearts, gills, bones, or blood. Would they be considered as a protein source by someone that was a vegan?

Any vegans that can comment?