The fish are usually those weeded out by breeders of expensive goldfish and, as such, usually die after one night but can grow to a good size when well looked after.
大抵は高級金魚養殖の選抜で間引かれた個体で、一晩で死んでしまうことも多いが、育て方が上手だと結構良い形に成長する。