Many people just found out that flashlight fish exist, thanks to the viral tweet below. The glowing fish have lights under their eyes that blink on and off. But it turns out that there’s even more ...

With distinct tubular eyes and a natural glow, two species of bioluminescent deep-sea fish nicknamed "barreleyes" have been identified. The newly described species are part of the family ...

The research maps biofluorescence across 459 glowing fish species and shows just how varied the colors have become.

Red light can’t penetrate far past the ocean’s surface, so researchers thought that most fish don’t perceive red light. But some reef fish have taken advantage of the absence of red light, using it to ...