LATIN DICTIONARYLexicon Latīnum
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“fish” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

fish v.
piscari (if with a rod and line, hamo); also, pisces capere (if with a hook, hamo).
FIG., To fish for compliments, laudem venari (Auct., ad Her., 4, 3, 5). To fish out anything, expiscari aliquid; from anybody, ab aliquo: to fish in troubled waters (Prov.), ex alienis incommodis sua commoda comparare (after Ter., And., 4, 1, 3), or ex alienis incommodis suam petere occasionem (after Liv., 4, 58).
fish s.
piscis (also collectively, as in English; e.g. pisce viventes, Plin.): sea-fish, piscis maritimus: river-fish, or fresh-water fish, piscis fluviatilis: a common fish, plebeiae cenae piscis: a small fish, pisciculus: very small fish., minuti pisciculi: full of fish, plenus piscium (Cic.; Verr., 4, 53, 118); poetically, piscosus, pisculentus: like a fish, *pisci similis. To catch fish, pisces capere. To angle for fish, pisces hamo capere. Salt fish, salsamenta, plur. He always sent to Puteoli to buy fish for the table, semper in cenam pisces Puteolos mittere emptum solebat (Varr., R.R., 2, 17, 6).
The Fish (a constellation), Pisces.

Quick answer

What is the Latin word for fish?
The usual Latin words for “fish” are piscor, hāmus, piscis; also pisciculus, piscōsus, pisculentus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.