The video shows a large fish swimming in the water. The fish has a black object attached to its back. The water is clear and blue, and there are rocks visible in the background. The fish is moving slowly and gracefully through the water, with its fins and tail moving in a coordinated manner. The black object on the fish's back appears to be a tag or a tracking device. The fish's scales are shiny and reflect the light from above. The video captures the beauty and tranquility of the underwater world.