Barinade
Barinade is the third boss in Ocarina of Time, residing in Jabu-Jabu's Belly. He is the guardian of the third Spiritual Stone, Zora's Sapphire.
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Barinade is surrounded by tons of electrified jellyfish, preventing any attack on its body. Getting rid of them should be the player's first task. This can be done with the boomerang.
Once all of the jellyfish are gone, Barinade will start to spin wildly through the room, whilst firing blasts of electricity at the player. There are more jellyfish that protect him while he is spinning. Take these things out like before to get a clear hit on Barinade with the boomerang to stun him. From there, attack using the Kokiri Sword. After a few hits, Barinade falls.
After getting rid of this foe, you will be rewarded with a Heart Container and the third Spiritual Stone, Zora's Sapphire.