Symbiosis
E. scolopes lives in a symbiotic relationship with the bioluminescent bacteria Vibrio fischeri, which inhabits a special light organ in the squid's mantle. The bacteria are fed a sugar and amino acid solution by the squid and in return hide the squid's silhouette when viewed from below by matching the amount of light hitting the top of the mantle (counter-illumination) . E. scolopes serves as a model organism for animal-bacterial symbiosis and its relationship with V. fischeri has been carefully studied.
Read more about this topic: Euprymna Scolopes