The term for the study of fish is ichthyology. This branch of zoology focuses on the physiology, behavior, ecology, and taxonomy of fish, a diverse group of aquatic organisms that play crucial roles in ecosystems. Ichthyologists study various aspects of fish life, including their anatomy, evolution, reproduction, and interactions with their environment. This field is essential not only for understanding fish species and their habitats but also for managing fisheries and conserving aquatic biodiversity. As over half of all vertebrates on Earth are fish, ichthyology plays a significant role in biological research and environmental conservation efforts.