The mesopelagic zone in the ocean is the area that occurs between depths of 200 meters (660 feet) to 1000 meters (3280 feet) below the ocean's surface. Although light reaching this level from the surface is very low to non-existent, there are some animals that have very sophisticated light-sensing mechanisms, such as fish with very large eyes. These fish are capable of sensing light levels that are less than 100 times what a human could sense. Also existing in this layer are bioluminescent organisms, which use their self-generated light as a lure for prey.

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