The video features a close-up view of a lionfish swimming in an aquarium. The lionfish has a distinctive appearance with its brown and white stripes and long, venomous spines. The aquarium is filled with small white rocks, and the water is clear, allowing for a detailed view of the fish. The lionfish moves gracefully through the water, its fins and spines gently swaying. The video captures the beauty and intricacy of the lionfish's appearance and movement.