Goldfish can survive up to five months in oxygen-less water at the bottom of frozen ponds by turning lactic acid into alcohol-ethanol.
Your pet fish's cognitive abilities will probably surprise you!
Before about 360 million years ago, no vertebrates had limbs. They all shared the same fish-like body shape. But around that time something exciting happened.
Do fish actually have a working memory? Recent experiments show that fish can in fact remember things for several days.