What pigmentation pattern is in all fish?

All fish exhibit some form of pigmentation pattern primarily due to chromatophores, which are specialized cells that contain different pigments. These patterns can vary widely among species and serve various functions, including camouflage, communication, and thermoregulation. Common pigment types include melanophores (black/brown), erythrophores (red), and xanthophores (yellow), which can combine to create intricate patterns and colors. Overall, while the specific patterns can differ, the presence of these pigment cells is a unifying characteristic among all fish.