Ichthyology is a specialized branch of biology that deals with the study of fishes. The term "ichthyological" is used to describe anything related to this field. However, there are several synonyms that one could use to describe the same. Some of these synonyms include fish biology, fishery science, fish research, fish studies, marine ecology, aquatic animal health, and fish systematics. Additionally, some professionals in this field may prefer using more specific terms such as ichthyography or fisheries biology, depending on their area of specialization. In summary, while "ichthyological" is the most common term, there are several other words that one could use to describe this scientific field.