The video shows a large black fish swimming in an aquarium. The fish has a sleek body, a pointed snout, and a large mouth. It is swimming among other fish, including a white fish with a pinkish hue and a blue fish with a yellow tail. The aquarium has a sandy bottom, and there are rocks and plants visible in the background. The water is clear, and the lighting is bright, highlighting the colors of the fish and the details of the aquarium environment.