The video shows a large group of fish swimming in the ocean. The fish are all the same species and are silver in color. They are swimming in a coordinated manner, moving in the same direction. The water is clear and blue, and the fish are swimming near the coral reefs. The reefs are green and have various shapes and sizes. The fish are of different sizes, but all have the same color and shape. The video is shot from above the water, giving a clear view of the fish and the reefs.