Fish on the other hand require electricity, at least in Texas, at least the kind I keep and have kept. And the tropical fish industry, fresh and saltwater, took a huge hit out of a weeklong power outage. Stores losing thousands in living inventory, hobbyists losing a lot too. Hobbyists with reef tanks got hit the hardest. And people with discus, which require very warm temperatures.
Nowadays I mainly service ponds, although I keep a few tropical fish in one commercial tank, and a few at my house. Pond fish handled the cold pretty well. I don't seem to have lost any. Took 2 days thawing to find out.