The video shows a large fish swimming in a tank of water. The fish has a long body and fins, and it moves slowly through the water. The tank is illuminated by a blue light, which creates a calming and serene atmosphere. The fish appears to be alone in the tank, and there are no other visible creatures or objects. The water is clear, and the tank seems to be well-maintained. The fish's movements are smooth and graceful, and it seems to be enjoying its environment.