Numerous cephalopods, together with no less than 70 genera of squid, are bioluminescent.[31] Some squid and tiny crustaceans use bioluminescent chemical mixtures or bacterial slurries in a similar way as a lot of squid use ink. A cloud of luminescent material is expelled, distracting or repelling a possible predator, http://zionsmevm.fitnell.com/35189141/bio-fluorescence-scattering-fundamentals-explained