This deep-sea fish takes it name from the fact that it dangles an enticing appendage over its mouth to attract prey
... of reflecting 
it, the lure is the only thing other deep sea creatures can see;... [DOC] [TLE] Mixon2016 - Kate's Ocean Animal Activity [PAR] Deep-sea Anglerfishes (Melanocetidae and Ceratiidae) Characteristics, Habitat, 
... and the male gets nourishment from her diet through the shared bloodstream.