Setting up an aquarium requires more than just buying a tank and filling it with water. You must also determine tank size, water temperature, and, of course, the fish that will call the tank home. To ...

A colourful aquarium always catches the eye. Most people go for gold or blue fish, but red fish bring a special warmth and ...

Deep-diving fish have a problem: The only light that penetrates their watery environment is blue and green hardly enough of a palette for flashy color patterns. Now, a new study reveals these fishes' ...

From red to white to orange to blue, fish flesh can land almost anywhere on the color spectrum. What's behind this huge variation? A lot of things — from genetics to bile pigments. And parsing the ...