Here's why:
* Freezing damages cells: When water freezes, it expands. This expansion inside the cells of a goldfish would cause them to rupture and die.
* No metabolic activity: Freezing stops all metabolic processes, including breathing and blood circulation. Without these functions, the fish's organs and tissues would be irreparably damaged.
While some animals like frogs can survive freezing, they have specialized adaptations to prevent ice crystal formation in their cells. Goldfish do not possess these adaptations.
It's important to remember that freezing a goldfish is cruel and will cause its death.