Barinade

Barinade, the Bio-Electric Anenome, is the third boss encountered in Ocarina of Time, and one of the hardest ones Link faces as a child.

In-game
Barinade is the boss of the Inside Jabu-Jabu's Belly dungeon. Similar to Gohma, this boss is the cause of its host's distress, as it is an electrical parasite that is weakening Jabu-Jabu, sucking his life energy through tentacles attached to the ceiling. He is surrounded by Bari. The hardest boss out of the three Link faces during his childhood, Barinade's fight has four phases. First, Link must sever all of the tentacles first, while avoiding the electricity Barinade shoots at him. Once the tentacles are severed using the Boomerang, Bari surround the boss, connected to him by charges of electricity. Both the Bari and electricity can harm Link, so, for the next phase, Link can weave in and out of the Bari to hit Barinade with the boomerang and then attack with his sword, or destroy the Bari with the boomerang. Once Barinade takes enough damage, he enters the next stage of the fight, in which he spins wildly around the room, firing blasts of electricity at Link and surrounding himself sporadically with Bari. Once Link destroys all of the Bari once more, Barinade will begin to burrow underground, shooting more electricity at Link, at which point he will have to weave closer to Barinade and stun him with the boomerang, then follow up with an attack from his Sword or a Deku Stick, until Barinade dies. The boss drops a Heart Container.

Trivia

 * Barinade's name possibly came from the name of the jellyfish-like enemy in the game, Bari, that surround him during the fight.