DANTE FENOLIO / SCIENCE PHOTO LIBRARY DANTE FENOLIO / SCIENCE PHOTO LIBRARY
The Palebelly Searsid (Barbantus curvifrons) is a Tube Shoulder. Tube Shoulders 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. This species ranges through both temperate and tropical waters around the world. Some descriptions of its range indicate that the species does not occur in the Western Atlantic; however, this individual was trawled from the Gulf of Mexico, from between 1,000 and 600 meters depth, 2016. These fish can be found from 4,500 meters depth to shallower depths of just several hundred meters. Image courtesy of the DEEPEND project.
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