The History of Sushi: From Fermented Fish to Modern Omakase

When most people think of sushi, they picture nigiri — a small block of rice with a piece of fish on top, served at a counter. This form is less than 200 years old and was initially fast food. The actual history of sushi stretches back over 1,500 years to preserved fish eaten in Southeast Asia, and the transformation from that origin to the omakase experience is one of the most dramatic evolutions in culinary history.

The Origin: Narezushi (Fermented Fish Rice)

Sushi in its earliest form was not about the rice. The rice was functional packaging.

The precursor to sushi originated in the river valleys of Southeast Asia — likely the Mekong and surrounding regions — where fish were preserved by layering them with salt and then with cooked rice. The rice fermented around the fish, producing lactic acid that preserved the fish over months or years. When the fish was ready to eat, the rice was discarded; it had been a preservation medium, not a food.

This technique traveled to Japan along trade routes, arriving around the 8th-10th century CE. The Japanese form was called narezushi (熟れ鮨) — "ripened sushi." The most famous surviving example is funa-zushi (鮒鮨), made from crucian carp in Shiga Prefecture (near Lake Biwa) and still produced today. Authentic funa-zushi ferments for one to three years; the result has an intense, pungent, funky flavor that bears no resemblance to modern sushi.

In narezushi, the rice was still not eaten. The fermentation was the entire point.

The Transition: Eating the Rice

The first change in sushi history was eating the rice. Sometime in the Muromachi period (1336-1573), Japanese cooks began consuming the rice alongside the fish — a form called namanare-zushi (生熟れ鮨) — before full fermentation had occurred. This was a practical adaptation: fermentation took too long, and partially fermented fish with partially fermented rice was edible and faster to produce.

This transition represents the first appearance of what we would recognize as the rice-plus-fish combination at the core of modern sushi.

By the Edo period (1603-1868), a faster version called hayazushi (早鮨, "quick sushi") became common — using vinegar to acidify the rice (mimicking the effect of fermentation) rather than waiting for natural fermentation. Hayazushi required days rather than months. The pressed oshizushi (押し鮨) tradition of the Kansai region (Osaka, Kyoto) developed during this period: fish and vinegared rice pressed in wooden molds, sliced and served. This form is still the dominant sushi style in Osaka and the historical tradition that the Kanto region later departed from.

The Revolution: Edomae Sushi and Fast Food

The form we now call "traditional sushi" — nigiri — was invented in Edo (present-day Tokyo) in the early 19th century, around 1824-1840. The inventor is traditionally credited to Hanaya Yohei, who operated a sushi stall in Ryogoku.

Edomae sushi ("in front of Edo Bay") was originally street food. The fish came from the nearby bay; the rice was seasoned with vinegar; the pieces were formed quickly by hand and served directly at a stall for immediate consumption. No counter, no omakase, no extensive menu — this was fast food priced for workers.

Two aspects defined early edomae sushi:

It was finger food. Eaten standing at the stall or seated casually. The idea of eating nigiri sushi with hands is not a recent affectation — it is the original mode.

Tane (the topping) was often cooked or preserved, not raw. The sushi culture of the 19th century used techniques to preserve and prepare fish that have mostly been abandoned: marinating tuna in soy sauce (zuke), simmering shrimp (ebi), grilling conger eel (anago), vinegar-curing gizzard shad (kohada), simmering abalone. "Raw fish" sushi was not the norm — it was one option among many preserved preparations.

The Tuna Reversal

Modern sushi's central fish — tuna, particularly bluefin — was historically unpopular in Japan. Fatty tuna (toro) was especially disdained; the Japanese term for fatty fish was abu (greasy), used pejoratively. Before refrigeration, fatty fish spoiled quickly and had an off-flavor associated with lower-class food.

The fatty parts of tuna were so undesirable in the early Edo period that they were fed to cats or discarded.

Refrigeration changed this completely. Once cold-chain storage made it possible to keep raw fatty fish reliably, toro became a delicacy — the most prized cut on a nigiri menu. The timeline: modern refrigeration became widespread in Japanese restaurants in the post-World War II period. Toro's rise to premium status happened largely in the 1960s-1980s.

Post-War Transformation: Kaitenzushi and Global Spread

Two developments in the post-war period transformed sushi from Japanese tradition into global phenomenon:

Kaitenzushi (回転寿司, "rotating sushi"): Invented in 1958 by Yoshiaki Shiraishi in Osaka, who installed the conveyor belt system after observing beer bottle production lines. Kaiten-zushi made sushi accessible and inexpensive — a chain-restaurant format where plates circle the belt and customers take what they want. Today, kaitenzushi chains (Sushiro, Kurasushi, Hama Sushi) serve hundreds of millions of customers annually and represent the majority of sushi consumed in Japan by volume.

The California Roll: Created in the 1970s by Japanese chefs working in Los Angeles (attributed to either Hidekazu Tojo in Vancouver or Ichiro Mashita in Los Angeles), the California roll replaced raw fish with avocado and imitation crab, and was rolled inside-out (nori inside rather than outside). It was a deliberate adaptation for American palates unfamiliar with raw fish and seaweed-outside rolls. The California roll created the gateway through which American consumers learned to eat sushi and later graduated to traditional forms.

Modern Sushi: Omakase and Return to Tradition

The current premium sushi tradition — counter omakase, chef-selected progression, live seafood, sustainable sourcing — is simultaneously traditional (returning to the intimate Edomae counter format) and entirely modern in its emphasis on sourcing, seasonality, and curation.

The contemporary omakase experience reflects several current values:

Hyperlocal sourcing: Premium sushi restaurants today often source specific fish from specific prefectures at specific points in the season. Santa Barbara uni in August; Hokkaido uni in October-November; Toyosu tuna from specific buyers.

No California Rolls: The high-end contemporary sushi world has retreated from westernization — modern omakase menus consist primarily of traditional Edomae preparations.

Aging and temperature control: Premium sushi chefs age fish at specific temperatures for specific periods to develop flavor and texture. Fish served at omakase is not necessarily fresh from the market that morning — it may be aged for 3-10 days.

Rice as central expression: The premium sushi conversation increasingly focuses on the rice itself — the specific vinegar blend, the temperature at service (body temperature, 37°C, is the target), the grain variety, the water-to-rice ratio.

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The 1,500-year arc of sushi history runs from preserved fish (rice discarded) to fast food (rice for convenience) to street food (rice as base) to global fusion (rice adapted) to contemporary omakase (rice as art). Each transition preserved something from the previous form while discarding what no longer served the moment.

Related reading: What Is Omakase? | What Is Uni? | How to Make Sushi at Home