The first division from sea level to 200 meters is labeled as the euphotic (sunlight) zone and says "sunlight rarely penetrates beyond this zone." Graphic representations of tuna are shown swimming in this first zone. The middle portion of the graphic shows the ocean divided into three zones.
The left side of this graphic shows a measuring stick against a representation of the ocean it shows three depths: sea level, 200 meters, and 1,000 meters and deeper.The aphotic zone is further subdivided into the bathypelagic zone (or midnight zone) between 1,000 and 4,000 meters, the abyssopelagic (or the abyss) between 4,000 and 6,000 meters, and the hadopelagic zone (or hadal zone) 6,000 meters and deeper. Sunlight does not penetrate to these depths and the zone is bathed in darkness. The aphotic zone exists in depths below 1,000 meters. Such a minuscule amount of light penetrates beyond a depth of 200 meters that photosynthesis is no longer possible. In this zone, the intensity of light rapidly dissipates as depth increases. The zone between 200 meters and 1,000 meters is usually referred to as the “ twilight” zone, but is officially the dysphotic zone. Only a small amount of light penetrates beyond this depth. This zone contains the vast majority of commercial fisheries and is home to many protected marine mammals and sea turtles. The upper 200 meters of the ocean is called the euphotic, or " sunlight," zone. The ocean is divided into three zones based on depth and light level. Sunlight entering the water may travel about 1,000 meters into the ocean under the right conditions, but there is rarely any significant light beyond 200 meters.
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