Swim along the edge of a coral reef and you'll often see schools of sleek, torpedo-shaped fishes gliding through the currents ...

However, a complete skeleton of the megalodon has not been discovered so far, and research on the megalodon's body length and shape has been conducted based on the only discovered vertebrae and ...

Judges and buyers pay attention to how healthy its skin looks, its size and body shape, and how gracefully the fish moves in the water. But the most important trait of all is the koi's coloring.