The image shows a large group of fish swimming in a large green tank. The tank appears to be made of concrete and is filled with water. The fish are of different sizes and colors, and they are all facing towards the right side of the image. In the center of the tank, there is a white cylindrical object with a mesh-like structure on top, which is likely a vent or a ventilator. The water is a light blue color and there are small ripples visible on the surface. The image is taken from a low angle, looking up at the tank and the fish.