Both species belong to the family Opisthoproctidae, also known as spook fish or “barreleyes”, named for the protruding cylindrical eyes that point upwards to detect the silhouette of prey ...

Of those 27 origins, 17 involve partnerships with glowing bacteria, which the fish took up from the surrounding water. Deep-sea anglerfishes housed the microbes in their back fins, which they ...

An ocean mystery - how the blackest fish in the deep sea are so extremely black ... "I couldn't get a good shot - just fish silhouettes," said Dr Karen Osborn from the Smithsonian Institution.