The video shows a catfish swimming in a tank. The catfish is dark in color and has a long whisker-like appendage on its face. It is swimming near the bottom of the tank, which is covered in small rocks and pebbles. The water in the tank is clear, and there are no other fish visible in the video. The catfish moves slowly and gracefully, its body undulating as it navigates through the water. The lighting in the tank highlights the catfish's features, making it the focal point of the video.