The image is a vintage scientific illustration of a fish, likely a study for identification or documentation. The fish is depicted in a dorsal view, with a streamlined body shape. It's rendered in a delicate blue pencil or watercolor wash, with small, scattered blue spots across its body. The fins are clearly defined, and the eye is a prominent feature. The illustration is on a cream-colored paper with handwritten notes and labels in German, indicating the species name and other details. The number '172' is written in red near the head of the fish. The overall style is characteristic of 19th-century natural history illustrations, emphasizing accuracy and detail.