The euphotic zone is the brightest in the ocean. Its towards the top of the waters and has tons of light. There is a very large amount of animals that are adapted to to living in this region. The bottlenose dolphin is one. Dolphins need to be near the top of the water because they come up for air, that they take in through their blowhole. These animals also live in the tropical and temperate waters, being towards the top means the warmer the water. Bottlenosed dolphins find food at the surface of the water, things like fish and squid are the main source of food.
The next is the "twilight zone", or disphotic. There is very little light here, almost none. The animals that live in the disphotic zone are adapted to life in near darkness, cold water, and high pressure. Many of the animals in this zone have large eyes, helping them see in the extremely dark waters. Most are small, dark, and thin. This helps camoflauge them. Many have large teeth and jaws. But among all the animals with teeth, jellyfish are in the small category that don't have any. Although they don't have teeth, they do eat fish. These animals don't have eyes, but they can light up and have a pulsating effect in the dark waters. Jellies have soft bodies and long, stinging, poisonous tentacles that they use to catch fish.
The deepest, darkest part of the ocean is the aphotic zone. Many of the animals here generate their own light. Their bodies are mostly all dark and long. Fish like the hatchetfish are adapted to look like the lighter waters above so they can't be seen different from the bottom. These fish have one side darker then the other and have photofors that can change to the color of the surface water above. This makes them almost invisible from below.
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