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Ichthyology, from Ancient Greek ἰχθύς (ikhthús), meaning "fish", and λόγος (lógos), meaning "study", is the branch of zoology devoted to the study of fish, including bony fish (Osteichthyes), cartilaginous fish (Chondrichthyes), and jawless fish (Agnatha). According to FishBase, 35,800 species of fish had been described as of March 2025.