無む光こう層そうMeanings1nounaphotic zonebiologyIn oceanography and biology, the deep-water layer below the photic zone where sunlight does not penetrate.無む光こう層そうには光こう合ごう成せいを行おこなう生せい物ぶつは存そん在ざいしない。No photosynthetic organisms exist in the aphotic zone.
