The light organ symbiosis between the hawaiian bobtail squid, euprymna scolopes, and the bioluminescent bacterium, vibrio fischeri, is used as at night the light organ crypt spaces contain the highest densities of bacteria (109/adult squid;
Euprymna Scolopes Light Organ / Inside the light organ, the squid secretes hydrogen peroxide which can be converted to hyphalous acid, another microbicide;
