The video shows a lionfish swimming in a coral reef. The lionfish has a distinctive appearance with its long, flowing fins and striped body. The coral reef is colorful and teeming with life, providing a beautiful backdrop for the lionfish. The fish moves gracefully through the water, its fins undulating gently as it navigates the complex terrain of the reef. The video captures the beauty and diversity of marine life, showcasing the lionfish as a fascinating and unique species.