Striped marlin are a species of billfish found in the Indian and Pacific Oceans. A feature that makes striped marlin unique from other billfish is their prominent vertical stripes that cover them from head to tail. When the fish is content, the stripes are typically a muted blue color, fading into their dark colored bodies. However, once a striped marlin becomes agitated or excited, their stripes will light up, turning an array colors from silver to cobalt.