Portuguese (Brazil) · Pronunciation Guide
oo PAY-shee. The x here is a "sh," and the final e comes out as "ee."
The diphthong is loud and counts as a single syllable. The word is invariable in the plural apart from adding an s — "os peixes" — and that added syllable doesn't move the accent, which stays on the diphthong.
Listen: o peixe
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O peixe nada no mar.
The fish swims in the sea.
Listen: O peixe nada no mar.
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"O peixe nada no mar" uses "nada" as a verb here rather than the pronoun meaning nothing — same spelling, same sound, and only the syntax separates them. "Mar" then ends on a vanishing r, so the sentence closes on almost nothing at all.
Reading x as "ks" gives "PAKE-see," which is the instinctive English approach and wrong here. It's "sh." Breaking the diphthong is the second error, and leaving the final e as "shay" is the third. Spanish speakers have "pez" and "pescado," neither of which helps.