He awed Babbitt by confessing that he often sat up till midnight reading the figures and footnotes in Government reports, or skimming (with amusement at the author’s mistakes) the latest volumes of chemistry, archeology, and ichthyology.
There are no more uses of "ichthyology" in the book.
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an avid fisherman with an extensive library not just on fishing, but also on ichthyology
And so the monster surfaced again, despite the endless witticisms heaped on it by the popular press, and the human imagination soon got caught up in the most ridiculous ichthyological fantasies.
Jules Verne -- Twenty Thousand Leagues Under the Sea