Fred Truluck of Bradenton said he picked up the piece of cardboard from a Corona beer case while walking with his dog because of the religious symbolism of the fish, WWSB-TV, Sarasota, reported Monday.
Truluck, who described himself as a devout Christian, said the religious symbolism became even more apparent when he took the cardboard fish home and flipped it over.
"I had it on the table, turned it over to the back, for some reason, and I said, 'Wow! There is Jesus,'" he said.
Truluck said he plans to frame the image and one day pass it down to his children.
Joe Davis, pastor at the Church of the Palms in Sarasota, said he is skeptical of the piece of cardboard's connection to the divine.
"I don't think God goes and draws his face on a carton of beer," he said. "If you are one of us that believes in the God of the Bible, the scripture teaches more is that God would rather show his image through the works and love of his people than interact in the world."