The Amazon Basin contains the largest number of scientifically described freshwater fish species in the world: 2,257 or 15% of the total number of known freshwater species. According to a new study, ...

Two species of damselfish may look identical—not to mention drab—to the human eye. But that's because, in comparison to the fish, all of us are essentially colorblind. A new study published online on ...

Blind Mexican cavefish became active in light while surface fish reacted to darkness, revealing how evolution rewired brains.

Fish exhibit a remarkable diversity of pigment patterns, arising from the spatial arrangement and interactions of specialised pigment cells known as chromatophores. Three principal chromatophore ...

ATHENS, Ohio (Aug. 18, 2008) — Though skin cancer is deadly to male fish, it also has one perk: The black melanoma splotches arise from attractive natural markings that lure female mates. A new study ...