The pineapplefish, Cleidopus gloriamaris, is a species of fish. It is also known as the knightfish or the coat-of-mail fish, due to the scales on its body. Some people call it the port-and-starboard light fish, as it has a pair of bright spots that are like a ship's lights. "Gloriamaris" is from the Latin language gloria and maris, means "glory of the sea". Due to its small fins and rigid armor, the pineapple-fish is a weak swimmer. A nocturnal species, it may be found inside caves and under rocky ledges during the day. In the Fly Point Halifax Park Aquatic Preserve, New South Wales, a small group of pineapple-fish has been documented under the same ledge for at least 7 years, and another group under a different ledge for 3 years.