In the field of biology, which discipline focuses on the study of fishes?

Ichthyology is the branch of biology dedicated specifically to the study of fish. This discipline encompasses various aspects including the anatomy, behavior, ecology, classification, and conservation of fish species. Ichthyologists conduct research that can inform us about fish populations, their habitats, and the impacts of environmental changes on aquatic ecosystems.

While zoology is the broader study of animals and could involve the study of fish, it does not specifically focus on them. Marine biology also studies oceanic life, which includes fish but is more concerned with marine ecosystems as a whole. Entomology, on the other hand, is the study of insects and does not relate to fish at all. Therefore, ichthyology is the most precise field related to the study of fish.