a new fish from the 13w36a snapshot!

The Pufferfish is an edible brewing ingredient caught by fishing and is in the food tab.

Using a pufferfish in a potion gives a potion of Water Breathing, allowing the player to breathe underwater for 3 minutes. However, eating a pufferfish gives the player Hunger III for 15 seconds, which over time takes 3 hunger bars, Nausea for 15 seconds, and Poison IV for a minute. Eating a pufferfish is the first and only way to get Nausea in survival mode. Pufferfish can be used to tame ocelots.

*from minecraftwiki :D