of or pertaining to the stratum of the oceanic zone where enough light is present for photosynthesis to occur.

1935–40; epi- + pelagic

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World English Dictionary
epipelagic (ˌɛpɪpəˈlædʒɪk)
of, relating to, or inhabiting the upper zone of the ocean from just below the surface to approximately 100 metres deep

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Example sentences
Compare that measurement to the depths of the shallowest parts of the ocean, such as the intertidal zone and the epipelagic zone.
The epipelagic zone is also known as the photic or euphotic zone, and can exist in lakes as well as the ocean.
Also referred to as the sunlight zone or the epipelagic zone.
The epipelagic zone extends from the surface downward as far as sunlight penetrates during the day.
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