The ocean water column is made up of 5 zones. The sunlight ... marine animals live in this zone and feed off of photoplankton (the basis of the ocean food chain) and smaller fish.

Barreleye fish live in the ocean twilight zone. When you purchase through links ... and the green pigment in their eyes likely helps filter out sunlight from the ocean surface.

The sighting is rare as the fish typically stays in the depths of the ocean below the sunlight zone. It’s perhaps the first time the fish has been spotted and reported at this depth.