The Hoopfish has audio in Subnautica: Below Zero, something it lacked in the original Subnautica.Judging by the tooltip for Cooked Hoopfish, their antennae are likely poisonous (or at least not very tasty).While schools of hoopfish will form periodically and evade predators en masse, this behavior is more social than it is defensive, and lone hoopfish are often found hunting for food and displaying generally curious behavior. May be a camouflage adaptation for mid-range light wavelengths, possibly indicating the hoopfish is more active at dawn and dusk. Rather than swimming, this lifeform uses the fine green antennae which encircle its body to alter the composition of the water in front of it, allowing it to 'sail' into the low density space created. Small, school-mentality prey fish with a unique method of propulsion, and a distant relative of the bladderfish. It will try to flee if approached by the player. The Hoopfish is a rather slow swimmer, and is mostly seen forming shoals in various biomes.

The Hoopfish's most distinct feature is the bright green bioluminescent antennae extending from the top and bottom of its head and bends around its tail forming a hoop. This creature has a compact main body with the top half covered in large, purple overlapping scales and the bottom half being smooth white skin and a black area around the mouth. It has two green eyes, a small dorsal fin and a purple caudal fin that wraps around its end. The Feather Fish is a small, edible fauna species.

The Hoopfish has a slim build, featuring a dark violet colored body that gradually transitions into blue towards the head, which has a bright neon green color. The Hoopfish is fairly easy to catch, as it doesn't retreat upon being approached by the player, and is easily recognized due to its bright bioluminescent glows. The Hoopfish is a common, passive fauna species that can be found in many Biomes.

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