There is a Islamic account of a giant fish/whale that carries the earth on its back and resides in a vast ocean. It is a authentic narration but is said its a Israiliyat account - meaning fables stories from Jews and Christians so it is not reliable.
I would like to know is there any such narrative found in Jewish traditions like Talmud Torah etc?! The only thing that comes close to it is the story of a mythical giant fish called Bahamut/ehemoth or Lutīyā. Sources linked below. Thank you.