Barreleye Fish

The Barreleye Fish is a creature in Beyond Blue.

Description
Description: This species is a small fish, not exceeding 10.5 cm (4.1 in) in length. The body of Opisthoproctus soleatus is deep and laterally compressed. Scales are large, thin, and cycloid. The ventral side of the body was described by Vaillant as a “flattened, oval, elongate sole.” The sole extends forwards below the head

Diet: Opisthoproctus soleatus has been found to primarily prey on bioluminescent siphonophores. The bioluminescence of these organisms makes them more difficult to detect against the dim incoming light; however, the structure of the lens and retina of O. soleatus increases the optics and resolution of the eye, allowing them to detect these cases of camouflage.

Behaviour: Like other deepwater fish, Opisthoproctus soleatus needs to find its prey in a very poorly-lit environment, and avoid being detected itself by a larger predatory species. Fishes with large upward-facing eyes likely hunt by detecting the silhouettes of prey above them in contrast to the low amounts of light coming in.