Why April Fools Day in France Involves Fish Pranks

04.04.2024 - 00:09 / atlasobscura.com / Jesus Christ / Ash Wednesday

If you find yourself in France on April 1, don’t be surprised if something seems fishy. Maybe someone gives you a chocolate or a pastry in the shape of a cod? Perhaps you find a paper haddock stuck to your back, and then everyone erupts into laughter and starts pointing and shouting “poisson d’avril”? Don’t be alarmed, you’ve simply immersed yourself in the centuries-long French tradition of April Fool’s Day, known as poisson d’avril or “April Fish.”

“The idea of April Fool’s Day, or April 1, as a special day is murky,” says Jack Santino, a folklorist and Professor Emeritus at Bowling Green State University in Ohio. “Every country has its own historical event they think gave rise to it.” But France’s tradition is the only one that involves aquatic life. Historians have many theories about the origins of this piscine tradition, but no overall consensus. The most common theories are connected to pagan celebrations of the vernal equinox, Christianity, a 16th-century calendar change, and the start of the French fishing season.

Some historians date this tradition back to the Ancient Roman pagan festival of Hilaria, a celebration marking the vernal equinox with games and masquerades. Santino says ancient Roman and Celtic celebrations of the vernal equinox are likely forerunners. Connections to those rituals “provide a kind of cultural vocabulary that people can draw on,” according to Santino. However, he believes they probably don’t have a direct connection to the fish part.

For some, that’s where Christianity comes in. The “ichthus” fish—an ancient Hellenic Christian acronym for “Jesus Christ, Son of God, Savior”—is nowadays widely recognized as a symbol of Christianity, but was originally used as a secret marker of Christian affiliation. Moreover, the Lenten forty-day period between Ash Wednesday and Easter Sunday prohibits the consumption of meat, so fish is often served as a substitute protein during this period.

As the end of Lent often occurs on or near April 1, celebrations including fish imagery would be apt to mark the end of the fasting season. Some even go so far as to surmise that poisson d’avril is a corruption of the word “passion,” as in “passion of the Christ,” into “poisson,” the French word for fish. Despite these cultural associations, Santino points out there is no actual evidence for this link to Christianity.

Then there’s the popular calendar change theory that has been widely discounted by experts today, but still comes up. In 1564, King Charles IX of France issued the Edict of Roussillon, which moved the start of the calendar year from somewhere in the period of March 25 and April 1 (different provinces kept their own calendars) to January 1.

Pope Gregory XIII standardized January 1