When I was younger I had a aquarium filled with I don't know what kind of fish. We just used a bucket to get them out of my grandma's pond. They were gray-ish and small. We also grabbed a couple small goldfish from her pond to go with whatever the other fish were.
Anyway, they lasted a few years... until the ice storm of 00/01 hit. Power went byebye for a couple weeks, and we got into a shelter as quickly as we could. When we got back to the house, after the power came back, we found the water, and thus the fish, in the aquarium had frozen solid.