The image is a close-up of a group of fish swimming in an aquarium. The water is dark blue and the fish are illuminated by a blue light, creating a beautiful contrast. The fish are of different sizes and shapes, and they are swimming close together in a group. On the right side of the image, there is a large rock formation, and on the left side, there are several smaller fish swimming around. The image appears to be taken from a low angle, looking up at the fish and the rock formation.