DANTE FENOLIO / SCIENCE PHOTO LIBRARY DANTE FENOLIO / SCIENCE PHOTO LIBRARY
The Dark Searsid (Mentodus facilis) is a Tube Shoulders. These fish expel a blue to green luminous fluid from a pore (the tubular papilla) which is located below the lateral line. The fluid is contained within something known as a shoulder sac apparatus, which is located under the shoulder girdle. The glowing fluid is hypothesized to be an escape mechanism, allowing these fishes to escape potential predators by distracting them with a brightly glowing cloud. Some species have light organs or photophores. This individual was trawled from between 1,500 and 1,200 meters depth, 2016. The species can be found from 2,000 meters depth to shallower depths of several hundred meters. Image courtesy of the DEEPEND project.
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