A close-up video captures a vibrant group of Koi fish swimming in a dark-bottomed pond or large tank. The water's surface shows ripples and reflections, indicating movement and interaction with the air. The fish are diverse in color and pattern, with many displaying bright orange and white markings, some with additional black spots. One fish is predominantly a pale grey or silver, while another shows a yellow and black scale pattern. Most of the fish are congregated near the surface of the water, with several opening their mouths as if feeding or anticipating food. Their bodies are clearly visible through the clear water, which has a greenish-brown hue in the background, possibly from reflections or submerged elements. The lighting highlights the glossy scales and distinct patterns of the fish.