Leaders at the nearby Al-Rahma mosque in Hatherley Street, are in no doubt about the authenticity.
Sheikh Sadek Kassem, the mosque's Imam, said: "This is a proof and a sign not just to Liverpool's Muslims, but for everyone."
The fish were bought last week from a pet store in Speke by Ali AlWaqedi, 23.
He spotted a squiggle on the side of one fish that mirrored the Arabic word for God - Allah.
Then he noticed another fish, in a different tank, that seemed to bear the Arabic spelling of Mohammed, known by Muslims as Islam's last Messenger.
Ali said: "This is a message from Allah to me, a reminder, and now my faith is stronger. Everyone is so excited by the discovery."
Andrew Chambers, a religious education teacher at Shorefields comprehensive school, said: "It's clear that the markings match the Arabic script."
The Merseyside marvel is a carbon copy of a discovery made earlier this year in Bury.
Locals flocked to village pet shop Water Aquatic after it was noticed that the markings on the scales of the two-year-old albino Oscar fish mimicked the Arabic script for Allah.
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