This image depicts an underwater scene within an aquarium tank, located at the Fluviário de Mora (Mora River Aquarium) in Mora, Portugal

This image depicts an underwater scene within an aquarium tank, located at the Fluviário de Mora (Mora River Aquarium) in Mora, Portugal. The primary subject is a large, grey sturgeon with an elongated body, positioned in the mid-water column, swimming horizontally from right to left. Its distinctive snout and barbels are visible. Below and slightly behind this sturgeon, a smaller, lighter-colored (pale yellow/white) sturgeon rests on the tank's bottom, also oriented to the left. Numerous dark-colored fish, appearing to be various carp species, occupy the left and central background of the tank, swimming in groups or individually. The tank's environment features a light-colored gravel substrate covering the bottom. Artificial rock formations, some stacked as a small pile, are visible on the bottom left, and larger rock structures line the right wall of the tank. The water is clear. Above the waterline, reflections and slight moisture marks are visible on the viewing glass, which separates the tank interior from a public viewing area. The lower portion of the image shows a grey floor surface and a dark, possibly wooden, trim piece directly in front of the tank. No human figures are clearly identifiable within the frame, although reflections suggest an indoor setting.