Dictionnaire des sciences naturelles, Strasbourg, Paris, F. G. Levrault, Le Normant, 1816-1830., The illustration depicts two distinct species of fish. The upper section showcases a rounded, slightly elongated fish with notable dorsal and anal fins, characterized by a smooth body and a projection at the end of its tail. The lower section features a more textured fish with a pronounced shape, adorned with intricate patterns across its body, including spots and scales. Both species are labeled with their scientific names, highlighting their classification within the field of ichthyology. The detailed representation emphasizes the unique anatomical features and textures of each fish, providing insight into their morphological differences.