The video shows a large red fish swimming in a tank of water. The fish has a long body and fins, and it moves gracefully through the water. The tank is well-lit, and the water is clear, allowing for a good view of the fish. The fish's scales are shiny and reflect the light, and its fins are spread out as it swims. There are no other fish or objects in the tank, and the background is plain and unobtrusive.