What happens every night in the ocean?

As the sun sets, fishes, squids, shrimps and zooplankton make massive migrations from the dark ocean depths upward to near the ocean's surface. Despite the small size of some (no bigger than a mosquito), these creatures can travel hundreds of meters in just a few hours.



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Such a minuscule amount of light penetrates beyond a depth of 200 meters that photosynthesis is no longer possible. The aphotic zone exists in depths below 1,000 meters. Sunlight does not penetrate to these depths and the zone is bathed in darkness.

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The sea level rises at night because of the influence of the moon's gravity. While it is not strictly tied to the day-night cycle, the moon's pull changes the distribution of water on Earth, most obviously in our oceans, where tides can rise and fall by several feet at a time.

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