No, ichthyology and marine biology are not the same, although they are related fields of study.
Ichthyology is a branch of zoology that focuses specifically on the study of fish. This includes their anatomy, behavior, genetics, physiology, and ecology. Ichthyologists may study both freshwater and marine fish species.
Marine biology, on the other hand, is a broader field that encompasses the study of all living organisms in the ocean and other saltwater environments. This includes not only fish but also marine mammals, invertebrates, plants, and microorganisms. Marine biologists study the interactions between these organisms and their environments, as well as the impact of human activities on marine ecosystems.
In summary, while ichthyology is a specialized field within marine biology, marine biology covers a much wider range of organisms and ecosystems.