No its not fish kept without proper filtration and water changes, ie a goldfish bowl. do not grow well, and will be stunted. thats where the story can from. Goldfish work by the same rules the rest of the fish world do. the availability of food being the only natural control on growth size.Yeah but that's true isn't it? They will die but I thought that their body only grows to their environment. I heard their internal organs carry on growing to full size though and that's what kills the goldfish having his organs growing but his body not