There are fish tanks down in the basement of the Crary Lab (where all the scientists hang out). The antarctic cod are a major source of food for the seals. Amazingly enough they have a type of 'antifreeze' in their blood stream that keeps it from freezing in the cold water. I think that's what the biologists here are studying. They don't taste very good. It's hard to see the Cod in this picture..(white arrow) but he sure looks scary and Hermiony didn't want to hang out there too long! They do move incredibly slowly though.