The image shows a large crab in an aquarium. The crab is in the center of the image, with its legs spread out and its body facing towards the right side of the frame. It has a long, slender body with a pointed head and two legs that extend outwards. The body of the crab is covered in small rocks and pebbles, and there are several smaller fish swimming around it. The background is a deep blue color, and the aquarium appears to be well-lit with natural light.