Crucian Carp Day (Funa no Hi)

What Is Crucian Carp Day?

Every year on February 7th, Japan celebrates "Crucian Carp Day" (Funa no Hi). The date comes from a wordplay on numbers: "2" can be read as "fu" and "7" as "na," together forming "funa." The day was established by the "Koga Funa Kanroni Preservation Society" in Koga City, Ibaraki Prefecture. Crucian carp have long lived in Japan's rivers and lakes and have been enjoyed as food for generations. This day aims to help people rediscover the deliciousness of crucian carp and to pass on this traditional Japanese food culture to future generations.

The "King of River Fish" That Supported Japanese Tables

Crucian carp were once an important source of protein in rural Japan. Living in rice paddies, streams, and moats close to home, "kan-buna" (winter crucian carp), which are especially fatty in the cold months, were considered a real treat. Sweetened simmered dishes (kanroni), fermented sushi (funazushi), sashimi-style preparations, and grilled skewers all developed as regional cooking methods -- making crucian carp a true "king of river fish" intertwined with Japan's traditional landscape.

Koga's Famous "Funa Kanroni"

Koga City in Ibaraki Prefecture, blessed with the Watarase River and vast wetlands, has long been known as a crucian carp production area. The kanroni made here is simmered slowly until even the bones become soft and edible. Its distinctive glossy finish and deep flavor have made it a long-loved treat for New Year's and special occasions, as well as a popular souvenir.

The Ancestor of Goldfish? Funa as the Origin of a Beloved Pet

The ornamental goldfish many people love is actually the result of breeding a mutated form of crucian carp (hibuna). Crucian carp are remarkably adaptable, possessing a mysterious vitality that lets them change form to suit their environment. Though they might seem plain and unremarkable, crucian carp are actually the ancestors of the colorful goldfish -- one of the fish most closely connected to human life throughout history.

A Barometer of Environmental Change

Because crucian carp live in freshwater close to people, their numbers are heavily affected by water pollution and invasive species in rivers and lakes. The decline of crucian carp, which used to be everywhere, is a sign of changes in Japan's aquatic ecosystems. Crucian Carp Day is also a chance to think not only about food culture but about the natural environment close to us that we need to protect.

Fun Facts About Crucian Carp

• Surprising lifespan: Crucian carp are surprisingly long-lived, often living 10 to 20 years or even longer depending on conditions.
• Many varieties: Japan is home to many species, including gengorobuna, ginbuna, and nigorobuna.
• The history of funazushi: Shiga Prefecture's local specialty "funazushi" is considered the origin of sushi (a type of fermented narezushi).
• Packed with nutrients: Rich in calcium, vitamins, and minerals, crucian carp has long been considered good for restoring strength.
• Fishing culture: The saying "Fishing begins and ends with crucian carp" speaks to how deep yet accessible this style of fishing is.

Tips for Enjoying Crucian Carp Day

• Order the regional specialty "funa kanroni" and enjoy it with freshly cooked rice
• Take a walk by a local river or pond and watch the water's surface for crucian carp
• Learn about traditional fermented foods like funazushi and Japan's food wisdom
• Watch goldfish and think about their tough, resilient ancestors -- crucian carp

A Tough, Unassuming Life That Blooms by the Water

Crucian Carp Day is a day to be grateful for a creature that has quietly but reliably supported our lives without ever seeking the spotlight. The way crucian carp survive vigorously even in muddy water teaches us about resilience. On February 7th, savor the bounty of Japan's rivers and take a moment to appreciate the long, rich history of coexistence between nature and people.