The video shows a large catfish swimming in a tank. The catfish is seen swimming around the tank, and at one point, it opens its mouth wide. The tank appears to be well-lit, and the water is clear. The catfish has a long body with a pointed snout and whisker-like barbels. The fish's scales are visible, and it has a pattern of dark spots on its body. The video is shot from above the tank, and the camera moves slightly to follow the catfish's movements.