Bladderfish (Subnautica)

The Airsack (in early builds called Bladderfish) is a Life-Form belonging to the Fauna category. It is both Catchable and Harvestable.

It's speed is rather slow and it's Attitude is Neutral, making it easy prey. Especially during night Airsacks are almost immobile due to their Diurnal (Dayactive) properties.

When sliced with a Knife it drops a Membrane. For this reason it's useful to players in the Survival mode as a source for Food and H2O (Water)

A possible change / crafting addition was mentioned on Trello.

Uses in Crafting
A full list of recipies using Airsack is found here:

A full list of recipies using Membrane is found here: