aphotic
Speech parts
1. aphotic - Adjective
2. aphotic - Adjective Satellite
Meaning
lacking light; especially not reached by sunlight
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Examples
the aphotic depths of the sea where no photosynthesis occurs
Narwhals, being black, hunt in large pods in the aphotic zone, but their underbelly still remains white to remain camouflaged when something is looking directly up or down at them.
Theoretically, some fish eyes can detect light as deep as 1000 m. At these depths of the aphotic zone, the only sources of light are organisms themselves, giving off light through chemical reactions in a process called bioluminescence.
Some biofluorescence in the aphotic zone is merely a byproduct of the organism’s tissue biochemistry and does not have a functional purpose.