This thing is scary...
It's from a WSJ article on a new discovery of a new drug that prohibits bacteria from communicating with each other. Apparently this angler fish uses bacteria to shine. A colony of bacteria glow on the tip of an appendage on the fish's head, enabling the fish to lure prey in the deep ocean darkness.
See the article and description here.
Remind me to stay away from deep ocean darkness.
Update, cause I know you want to see more. Found another picture of an angler fish.
Pic by charminbayurr from Flickr