The image is an underwater photograph of a large group of fish swimming in an aquarium. The fish are of different sizes and colors, including orange, black, and white striped, and are swimming around a large rock formation. The rock formation is covered in green algae and plants, and there is a small waterfall cascading down the side of the rock. The water is clear and blue, and the background is slightly blurred, giving the impression of a peaceful and serene environment. The overall mood of the image is calm and peaceful.