A photorealistic image of a common carp wearing a Santa hat, styled with National Geographic-like precision. The fish is depicted in a crystal-clear freshwater setting with vibrant aquatic plants, illuminated by natural sunlight filtering through the water. The Santa hat is vividly detailed, slightly askew on the carp's head, adding a whimsical holiday charm. The background emphasizes the underwater environment with a serene, almost magical atmosphere, focusing on the interplay of light, shadows, and bubbles.