The specialized field of zoology that focuses on fish is called ichthyology. Ichthyologists study a wide variety of fish species, their biology, behavior, ecology, and conservation. This branch of science is crucial for understanding aquatic ecosystems and the roles fish play within them. Ichthyology also examines the impacts of overfishing, habitat loss, and climate change on fish populations. By researching fish diversity and health, ichthyologists contribute to the management of fisheries and the preservation of marine biodiversity. Their work supports sustainable practices that ensure fish species thrive in their natural environments.