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.

Fish are responsible for capturing billions ... So the plants can't live down in this dim lit zone - and not the deepest part of the abyss. So it's kind of that in-between layer.

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.