Bioluminescence probably produced by Lingulodinium polyedrum, a species of the genus Dinoflagellate, in the waters around Toco, 2004. These unicellular organisms rise to the surface at night to breed (blooming). They glow when they are disturbed, in this case because of the wave action on the rocks. The luminescence on this particular night was very dim, just visible to the naked eye. It seems brighter in the photograph due to the cumulative light-gathering nature of film during a long exposure, in this case, of over an hour. 4x5 large format camera, Kodak Ektachrome film.

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