The scientific study of fish is called ichthyology. This branch of zoology focuses on the biology, ecology, evolution, and classification of fish species. Ichthyologists study various aspects of fish life, including their physiology, behavior, habitats, and relationships with other organisms. This field plays a critical role in understanding aquatic ecosystems, as fish are vital components in many food webs. Additionally, ichthyology contributes to conservation efforts, helping to manage fish populations sustainably and protect endangered species. The study of fish is essential for both ecological research and for industries reliant on fishing and aquaculture.