Deep-sea shrimp have organs called photophores, which emit this to help identify a mate
... evade predators, or attract a mate, while the host provides the bacteria 
with an .... (A) In the deep-sea anglerfish Linophryne coronata, bioluminescence 
from... [DOC] [TLE] Fishy Deep-Sea Designs - NOAA Ocean Explorer - National ... [PAR] Many midwater fishes have light organs, or photophores, that produce light.