The video shows a group of fish swimming in the ocean. The fish are of different sizes and colors, with some being yellow and others being dark blue. They are swimming near a rocky coral reef, which is covered in algae and other marine plants. The water is clear, and the sunlight is shining through, creating a beautiful underwater scene. The fish are moving gracefully, and their fins and tails are visible as they swim. The coral reef provides a home for these fish, and the video captures the beauty and diversity of marine life.