denoting or relating to the uppermost part of a sea or lake down to about 100 metres depth, which receives enough light to enable photosynthesis to take place
Word origin
C20: from eu- + photic
euphotic in American English
(juˈfoʊtɪk)
adjective
Ecology
of or pertaining to the uppermost portion of a body of water that receives sufficient sunlight for photosynthesis