The video shows a close-up aerial view of several koi fish swimming in dark water. The fish are of various colors and patterns, including red, white, black, and yellow. Some of the fish are seen from the side, while others are viewed from above. The water appears still, with reflections of the fish and the sky visible on the surface. There are also a few small bubbles in the water. The overall impression is one of peaceful movement and vibrant colors in a serene aquatic environment.