The video shows a close-up of a fish swimming in an aquarium. The fish is yellow and green in color, with a white mouth and black eyes. It has a round body and fins that are visible as it moves. The fish is seen swimming around the tank, occasionally opening its mouth as if it is trying to catch something. The background of the video is a dark blue color, and the bottom of the tank is covered in white sand. There are no other fish or objects visible in the video.