Other videos showed two species of cusk eel, Bassozetus sp. and Barathrites iris, swimming tail-first away from the camera ...

In the vast, open water, fish rarely swim solo. Instead ... critical survival tactics in the underwater world. Here are five photos that beautifully illustrate why fish choose to group up.

From a research vessel in the Pacific Ocean, scientists watched the feeds of several cameras sitting on the seafloor. Miles below, a deep-sea fish approached the camera’s bait then, changing its ...