Lots of cephalopods, including no less than 70 genera of squid, are bioluminescent.[31] Some squid and smaller crustaceans use bioluminescent chemical mixtures or bacterial slurries in a similar way as several squid use ink. A cloud of luminescent material is expelled, distracting or repelling a potential predator, when the http://designoptics81357.bloguetechno.com/5-Tips-about-Bio-fluorescence-You-Can-Use-Today-29958657