A school of koi fish swim in a pond. The water is greenish and appears murky. Sunlight reflects off the surface of the water, creating bright spots and ripples. The fish are various colors, including orange, yellow, white, and black. They are densely packed together, with some fish appearing to be competing for food. Their mouths are open and submerged, suggesting they are actively feeding. The overall impression is one of a vibrant and active aquatic environment.