The ocean sunfish, or Rātāhuihui in Māori, is the heaviest known bony fish in the world with adults weighing between 247 and 1,000 kg. Another name for sunfish is Mola mola.

There are two meanings of the word spine: 1. The backbone of a creature that extends from the bottom of their head/skull all the way down their back. And 2. a stiff, pointed, part that sticks out from a creature. E.g. the pointy spines of a fish or kina.