Ans: Ichthyology is the branch of zoology, which shows the study of fishes. It includes bony fish, cartilaginous fish, and jawless fish. This discipline includes biology, taxonomy, and conservation of fish and commercial fishes. Since fish is a major source of food for people, the study of ichthyology is also economically important. As fishing is one of the oldest occupations of mankind and east to obtain a source of food. It's easy accessibility adds an advantage to ichthyology. The person, who chooses a career as ichthyology meaning study of fishes, rays, sharks, sawfish..etc.