At the beginning of the dungeon there is a room that has a path going around the outside with some floating jellyfish and two crates. After you have defeated the mini-boss and Ruto has gone missing, return to this room. There should be a piece of 'flesh' on the edge of the wall letting you access a door. To get in you need to put one of the crates on the switch. Once in this room, just follow the dungeon map until you reach the bosses lair.
Get a fish in a bottle, go in front of him and use it.
Inside lord jabu jabu's belly.
Barinade is the boss of Inside Jabu-Jabu's Belly, the third dungeon in The Legend of Zelda: Ocarina of Time. This parasitic organism is revealed to be the cause of Lord Jabu-Jabu's gastrointestinal distress. It appears to have a symbiotic relationship of some sort with Bari.
The THird OOT boss is Barinade, Who you fight in Lord Jabu-Jabu's Stomach. He's quite easy. Really. Don't die when or if you fight him.
You get the boomerang while you're a child in Lord Jabu-Jabu's stomach. It is obtained after beating the mini-boss.
catch a fish and dump it near his mouth.
She is inside Lord Jabu-Jabu
You have to be an adult, Most of the ground will be frozen and jabu-jabu will be gone. Just navigate the ice and make it to the cave.
For the little jellyfish, you simply hit them with your sword a couple times or use the boomerang on them after you obtain it. If you meant the boss, you must destroy its tentacles with the boomerang and then stun the body with the boomerang; then hit it with the sword.
I am not sure this is what you meant but to get into Jabu-Jabu you take a fish and put it right in front of his mouth
You don't kill Jabu Jabu yourself. However, after seven years pass and you become Adult Link, where Jabu Jabu is in Zora's Fountain is replaced by ice. There's no explanation for his absence, although it's possible that Ganondorf may have killed him.
To rescue Princess Ruto from inside Jaba Jaba's belly pick her up, go through the water in the tunnel in the room next door, and throw her on to the ledge. Use the platform to go to the top floor and then use her as a weapon by throwing her at the Biri. Now take the path to the left and work through the rooms fighting off the tentacles.