Stone Stuck In Uretha My Goldfish Has A Stone Stuck In It's Mouth!?

My goldfish has a stone stuck in it's mouth!? - stone stuck in uretha

Shibunkin My goldfish has a stone in his mouth and does not seem able to spit. I cherish the idea that this generation it'self and eat, but I'll make you not even come to the surface. How do I get the stone, without killing him?