The illustration features two distinct fish species, labeled for identification. On the left, a smaller fish is depicted with a streamlined body, emphasized with fine details that highlight its scales and fins. To the right, a larger fish showcases similar anatomical features, exhibiting a more robust shape. Above these specimens, a detailed outline of the head of a similar fish species further aids in distinguishing characteristics such as the shape of the head and fin structure. Each element is rendered with precision, providing an educational reference on the morphology of these aquatic creatures.