Ichthyology is the branch of zoology studies fishes. This includes the bony fishes (Osteichthyes), the cartilaginous fishes (Chondrichthyes) such as sharks and rays, and the jawless fishes (Agnatha).
... character, Anna, is the wife of the bureaucrat Karenin. She is invited from her home in St Petersburg to Moscow to mediate the marital discord of her brother Stepan ...