Ichthyology

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A topic known well beyond its field, found in many languages.

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What Wikipedia says

Ichthyology 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.

Excerpt from the Wikipedia article “Ichthyology”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: myself, derived as above, Public domain, via Wikimedia Commons.