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A salp swarm at night

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Researchers Laurence Madin and Erich Horgan (WHOI) and Patricia Kremer (University of Connecticut), Scuba diving—after midnight, 150 miles from shore and at about 100 feet depth in the north Atlantic—encounter a very dense swarm of salps, both single individuals and chains. The divers, equipped with lights, were there to photograph, collect, and study this species (Salpa aspera), which migrate up to the surface at night and down in the day. (Video courtesy of Erich Horgan, Woods Hole Oceanographic Institution)