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Symbiotic relationship

The Hawaiian bobtail squid, its photophores populated with Allivibrio fischeri Further information: Bioluminescence and Counter-illumination A. fischeri have symbiotic relationships with several marine animals. The most prolific of these relationships is with the Hawaiian bobtail squid (Euprymna scolopes). A. fischeri inhabit photophores in the mantle of the Hawaiian bobtail squid. A. fischeri cells in the ocean inoculate the light organs of juvenile squid and fish. Squid have epithial fields that the sea water filters through leaving the A. fischeri behind. Ciliated cells within the animals' photophores (light-producing organs) selectively draw in the symbiotic bacteria. These cells promote the growth of the symbionts and actively reject any competitors. The bacteria cause these cells to die off once the light organ is sufficiently colonised.