One sorority at my school used goldfish during formal rush. Each table had a large brandy snifter with a tiny goldfish in it... it looked great
A sister I talked to loved it - she said it was a good way to get a lagging conversation going again. I think individual sisters took them home afterwards and took care of them.
Unfortunately, one year they got the fish too early, or didn't properly aerate the tank they kept them in before rush, or something... so the fish started going belly up during the party
