noun
telescope goldfish; demekin
A variety of goldfish with protruding eyes. Often kept as an ornamental pet.
出目金はその飛び出した目が特徴的だ。
The telescope goldfish is characterized by its protruding eyes.
金魚すくいで出目金をすくった。
I scooped a telescope goldfish at the goldfish scooping game.
金魚 is the general term for goldfish, while 出目金 refers specifically to the telescope-eye variety.
Compound of 出目 (protruding eyes) and 金, short for 金魚 (goldfish). The exact origin of the variety is uncertain, but it is a well-known ornamental goldfish breed.