Sanma: Japan's Autumn Fish and Why Pacific Saury Season Is a Cultural Ritual

Sanma (秋刀魚) — the kanji translate literally as "autumn" (秋) + "sword" (刀) + "fish" (魚) — is Pacific saury, Cololabis saira, a slender, iridescent blue-silver fish about 25–30 cm long that migrates south from colder northern Pacific waters as autumn arrives in Japan. The fish itself is not rare. What is remarkable is what Japanese food culture has built around it.

The sanma season — September through October, sometimes extending into November — is anticipated, narrated, worried about (poor seasons due to warming oceans cause genuine national concern), and mourned when it ends. The arrival of sanma at fish markets is reported in national news. A bad sanma haul in a given year is covered as a significant story. This is a country that has channeled substantial collective emotion into a single seasonal fish.

What Sanma Tastes Like

Sanma is an oily fish with an intense, rich flavor — closer in character to mackerel (saba) or sardines than to mild white fish. It has:

High fat content, particularly in peak autumn when the fish have fed extensively on prey during summer migration — the fat is distributed through the flesh, not just under the skin
Pronounced umami from the oil concentration in the flesh
Slight bitterness from the innards, which are typically left in during cooking (see below)
Clean finish that is not "fishy" in the off-putting sense but clearly oceanic and deeply savory

The flavor intensity is central to its appeal. Sanma is not subtle. Eating a whole grilled sanma is a committed act of engagement with the fish — not a gentle background protein.

The Innards Question

Standard sanma preparation for salt-grilling (shioyaki) does not remove the innards. The gut is left in during cooking. This is intentional.

Why: The gut cavity of a healthy, peak-season sanma contributes a slight bitterness that many Japanese eaters consider essential to the experience — it provides counterpoint to the richness of the fish fat. The bitterness is described as wata (腸) flavor — not unpleasant but present and specific.

For those unfamiliar: The innards are enclosed in the body cavity; eating around them is possible. They are softer than the flesh and slightly darker. Some people eat them, many don't.

Cleaned sanma: Fish sellers will clean sanma on request; pre-cleaned frozen sanma is also common. The flavor without innards is milder and more uniformly rich. Purists prefer the uncleaned preparation during peak season.

The Salt-Grill Technique (Shioyaki, 塩焼き)

Shioyaki (literally "salt grilling") is the standard and near-universal sanma preparation. The technique is minimal by design — the fish is so flavorful that elaborate seasoning would compete rather than enhance.

Method

Equipment: A traditional shichirin (七輪) ceramic charcoal grill is ideal — charcoal heat produces the characteristic char and smoke. A home oven grill or broiler works acceptably; a gas grill in between.

Salt: Sprinkle fine salt generously over the entire surface of the sanma — both sides, the head, the tail. Do not rub in; let it sit for 5–10 minutes. The salt draws out surface moisture and seasons the skin.
Pat dry: Blot excess moisture from the surface before grilling.
Grill: Place over charcoal or under a broiler at high heat. Grill for 5–7 minutes per side, depending on the thickness of the fish. The objective is clearly charred skin — the skin should char and crisp, especially the tail (the "tail fin" char is a sign of proper high-heat cooking). The fish is cooked through when the flesh separates from the bone along the lateral line.
Do not move: Let the fish sit undisturbed on each side until the char develops. Moving it breaks the skin.
Serve whole: Presented on a long rectangular plate, the whole fish lying flat.

The Accompaniments (Non-Optional)

Grated daikon (oroshi daikon, 大根おろし): A substantial mound of finely grated white radish alongside the fish. The daikon provides cooling, cleaning contrast to the oily fish. Squeeze some soy sauce over the daikon before eating. This is not optional — eating sanma without daikon is considered incomplete.
Sudachi (酢橘): A small Japanese citrus fruit, harder and less sweet than yuzu, with a sharp green acid character. Squeezed over the fish just before eating. Kabosu can substitute; lemon is a distant substitute. The acid cuts the fat.
Soy sauce: For dipping or drizzling, particularly over the daikon.

Eating Technique

The proper eating method for whole sanma:

Eat the top half of the fish first, working flesh off the spine with chopsticks
Lift the spine by the head end, pulling it away cleanly from the lower half (peak-season sanma separate cleanly from the bone)
Eat the bottom half

This produces clean boneless eating without the initial difficulty of bone navigation.

Seasonal Price Fluctuation

Sanma pricing in Japan varies dramatically with the size of the annual migration:

Good year: ¥100–¥200 per fish at supermarkets. A sanma teishoku (set meal) at a restaurant: ¥700–¥1,200.
Poor year: ¥500–¥800 per fish or unavailable at many shops. Restaurant prices double or triple.

Recent years have trended toward poor seasons due to climate change-related shifts in water temperature and migration patterns. The decline in sanma availability has been covered extensively in Japanese media — there is a genuine sense that a beloved seasonal tradition is under ecological threat.

The Meguro Sanma Festival

One of Tokyo's most specifically odd food events: the Meguro Sanma Festival, held annually in late September in the Meguro ward of Tokyo.

The backstory: Meguro — a central Tokyo neighborhood with no port, no coastal connection, and no historical relationship with fish — became the ironic venue for a sanma celebration through a traditional Edo-period comic story (rakugo). The story involves a Edo lord who tastes salt-grilled sanma at a commoner's stall in Meguro — his first time eating it outside the de-fatted, carefully prepared version served at his castle — and declares it the best thing he has ever eaten. "The sanma at Meguro is best" (Meguro no sanma) became a shorthand for the idea that context and simplicity make food good, not elaborate preparation.

The modern festival: Every September, Meguro holds a sanma festival where fishermen from Kesennuma in Miyagi Prefecture (a major sanma fishing port) donate fresh sanma, grilled on-site and served free to lines of several thousand Tokyo residents. The event is both earnest celebration and in-joke about the rakugo story.

Sanma as Cultural Touchstone

The annual news coverage of sanma season hauls — the reports on catch numbers from the Sanriku coast and Hokkaido, the concern in lean years, the celebration in abundant ones — positions this fish as something between an ingredient and a cultural event. Japanese media treat poor sanma seasons with the same registers used for natural disasters or agricultural failures; abundant years are reported with relief.

This is the shun principle (旬 — the idea that ingredients have a peak moment of quality that should be honored) extended to its fullest cultural elaboration. Sanma could theoretically be available year-round frozen, and it is. But eating frozen sanma in July is not the same thing as eating fresh sanma in October — even if the physical object is identical, the seasonal meaning of the act is absent. Japanese food culture insists on this distinction, and sanma is one of its clearest illustrations.

The full recipes live in the book.

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