There are multiple articles from the early 2000s that describe a strange incident in which a fish began talking. The event seemed to have happened shortly before the 13. of march 2003.

Specifically, it was a large carp in a Hasidic Jewish fish shop that began shouting in Hebrew, warning of impending doom. The voice of the fish was first noted by a Latin American immigrant working in the shop who was about to slaughter the fish.

''I screamed, 'It's the devil! The devil is here!' '' he recalled. ''But Zalmen said to me, 'You crazy, you a meshugeneh.' ''

The owner of the shop heard noted the shouting, and how the fish identified itself as a man in the community who had died last year and warned of impending doom. After this, the shop owner killed the fish with a knife.

The fish commanded Mr. Rosen to pray and to study the Torah and identified itself as the soul of a local Hasidic man who died last year, childless. The man often bought carp at the shop for the Sabbath meals of poorer village residents.

After this, the story gained widespread attention in the Jewish community.

He said that Spanish-speaking rabbis have been calling his home every day and night asking him to recount the story.
''It's just a big headache for me,'' he added. ''I pull my phone out of the wall at night. I don't sleep and I've lost weight.''

Here are some of the articles:

Word is made flesh as God reveals himself... as a fish

'Talking fish' stuns New York

Monsey Butcher: “Talking Fish Made Me Do it”

Talking fish not an omen against war

Miracle? Dream? Prank? Fish Talks, Town Buzzes

The Incredible Talking Fish

I'm upvoting this because of the sheer hilarity, not because I believe fish can talk. In Hebrew or otherwise.