The video shows a large fish swimming in a tank of water. The fish has a silver body with a long tail and fins. The water is clear and the fish is the only visible creature in the tank. The background is blurry, but it appears to be a room with a window. The fish moves slowly and gracefully through the water, occasionally turning its body to show its side and belly. The lighting in the room reflects off the water's surface, creating a shimmering effect.