Bladderfish (Subnautica)

The Bladderfish is a life form belonging to the fauna category. It is catchable and edible, mostly populating in the Safe Shallows and the Grand Reef.

The Bladderfish stands out in comparison to other small fishes, as they can be used to craft Filtered Water. As a result, Bladderfish are a good source of H2O, though behind Disinfected Water and Big Filtered Water.

Being slow and passive, Bladderfish are easy to catch, especially during night time, when they are next to immobile due to their diurnal properties.

Appearance
The Bladderfish is a small creature comprised of a long, extremely thin main body with large translucent bladders on top and bottom. These bladders have slim tube-like structures protruding out from their outer edges, and they undulate as the Bladderfish moves.

The Bladderfish's head is bright orange and ovular in shape, possessing a pair of large eyes and no mouth. The air bladders have a faint violet bioluminescent glow.

Behavior
The Bladderfish swims by constantly contracting and expanding its air bladders, constantly altering its speed between fast and slow. It also tends to form small shoals.

The Bladderfish will flee from the player upon being approached by them.

Data Bank Entry

 * 1) Semi-permeable membrane: Body consists of an oxygen- and water-filled, semi-permeable membrane. No oral cavity detected. Membrane may filter plant matter from the water.
 * 2) Open-ended vascular tubing: Can be angled and contracted to pump out water and achieve low-velocity, guided propulsion. No fins identified.
 * 3) Mostly oblivious to threats, its only identified defense mechanism: it is 95% cartilage.

Assessment: Membrane may have applications as a natural water filter

Trivia

 * In Freedom mode, Bladderfish can be clicked to replenish the oxygen bar.
 * The original name for this creature was Bladderfish, it was later changed to Airsack, but was then changed to Bladderfish again.