The video shows a lionfish swimming in the ocean near a coral reef. The fish has a brown and white striped body with long, flowing fins. It moves gracefully through the water, surrounded by colorful corals and other marine life. The lionfish's movements are slow and deliberate, as it navigates through the complex environment of the reef. The video captures the beauty and diversity of marine life, showcasing the unique features of the lionfish and its surroundings.