Isopods are ectoparasitic crustaceans of marine and freshwater fish with diverse morphology where taxonomic studies involve a series of methods for collection, fixation and techniques for illustrating the species. These methods are applied in a series of studies involving ecology, distribution, biodiversity and morphology. However, approaches from the perspective of scientific illustration are often lacking in the study of parasitic isopods. This study provides a background on the illustration of these organisms by observing published works and presents the application of mixed color technique in the illustration of these invertebrates. This study combined information from the literature and ichthyoparasitological studies involving taxonomy and scientific illustration. The history of isopod illustrations revealed that some older illustrations present greater visual and scientific elabora...