As of April 2008, the largest goldfish in the world was believed by the BBC to measure 19 inches (48 cm), and to be living in the Netherlands. At the time, a goldfish named "Goldie", kept as a pet in a tank in Folkestone, England, was measured as 15 inches (38 cm) and over 2 pounds (0.91 kg), and named as the second largest in the world behind the Netherlands fish. The secretary of the Federation of British Aquatic Societies (FBAS) stated of Goldie's size, "I would think there are probably a few bigger goldfish that people don't think of as record holders, perhaps in ornamental lakes". In July 2010, a goldfish measuring 16 inches (41 cm) and 5 pounds (2.3 kg) was caught in a pond in Poole, England, thought to have been abandoned there after outgrowing a tank.
Goldfish have one of the most studied senses of vision in fishes. Goldfish have four kinds of cone cells, which are respectively sensitive to different colors: red, green, blue and ultraviolet. The ability to distinguish between four different primary colors classifies them as tetrachromats.
Goldfish have one of the most studied senses of hearing in fish. They have two otoliths, permitting the detection of sound particle motion, and Weberian ossicles connecting the swimbladder to the otoliths, facilitating the detection of sound pressure.
Goldfish have a memory-span of at least three months
Many people say that goldfish have a memory of just a few seconds, but this is a myth! Goldfish have a memory span of at least three months!
其實金魚是可以吃的，因為金魚的祖先是鯽魚，所以金魚是沒有毒的。 有些網友會說金魚是人工飼養出來的有毒品種其實是錯誤的說法。 ... 而且金魚的肉不好吃，因為金魚都是吃魚飼料長大的，家養的魚哪裡比的上野生的魚，金魚肉少刺還多，又不好吃，作為吃貨的中國人才不會喜歡吃呢。
Are Goldfish Edible?
Goldfish are descendant of carp, which used to be raised for food in ancient Asia. Carp are still the premiere game fish in Europe and considered the most valuable food fish in Asia. That being said, carp isn’t used as a food fish in the United States because it’s extremely tough, bony and greasy. Plus pet fish can carry disease; any other fish makes a better, more filling and healthier meal