The video shows a large fish swimming in a dark water tank. The fish has a long body and a pointed nose, and it is moving slowly through the water. The fish's scales are a mix of dark and light colors, and it has a long tail that it uses to propel itself forward. The water in the tank is clear, and the fish is the only living creature visible. There are no other objects or creatures in the tank, and the background is dark, making it difficult to see anything else. The fish appears to be healthy and is swimming calmly.