From the surface to around 200 m
The euphotic zone is the depth of the water in an ocean, that receives enough sunlight for photosynthesis to occur. The depth of the photic zone can vary greatly depending on the turbidity of the water and the strenght and direction of sunlight.
The euphotic zone is where nearly all the primary production in the sea takes place. Photosynthesis occurs in this zone providing producer organims which can support large food webs.About 90% of all marine life lives in this region.
From 200 m to around 1,000 m
The mid layer of an ocean. It receives only very weak, filtered sunlight during the day. There is not enough light for photosynthesis to take place, so no plants live in this zone. There is not much food available in this zone.
From 1,000 m to around 4,000 m
The aphotic zone is the region of an ocean where less than 1% of sunlight penetrates. Most animals survive in this zone by consuming the snow of detritus falling from above or by preying on others.