When eaten, the pufferfish replenishes one Hunger point. (half a shank) However, it will give a player Nausea and Hunger III for 15 seconds, as well as Poison IV for 1 full minute.
How do you get infinite water breathing in Minecraft?
Quote from video: Enchantment. This is an enchantment for the helmet. And the turtle. Shell it will increase the breathing time by 15 seconds. Per a level of the enchantment.