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You know, this is anime and it's extremely crazy (colorful, fairy-tale) and unnatural, so they couldn't transfer everything as it looked in the comics. As for Arlong, I don't know if I understood correctly. A friend who is interested in fish says that Arlong's nose has been rendered very well, in the sense of what we see in the manga.

No, the nose is fine. What I don't like is the size of Arlong's body; it's too small and square.xD