Japan — Hokkaido and Tohoku Pacific coast autumn migration; Hokkaido port of Kushiro and Miyagi's Kesennuma are famous sanma landing cities
Sanma (Pacific saury, Cololabis saira) is Japan's most emblematic autumn fish — a sleek, silver, oily fish of 30–40cm that migrates south along the Pacific coast from Hokkaido each autumn, growing fat on the cold northern waters. Its arrival marks the transition to cooler weather, and sanma shio-yaki (salt-grilled Pacific saury) is one of Japan's most celebrated seasonal dishes, sold at neighbourhood grills and featured on restaurant menus that have been anticipating its arrival for months. The fish has a short peak window — September and October — when fat content is highest. Beyond shio-yaki, sanma is used for sashimi (in the first weeks when the fat is highest), kabayaki (grilled in teriyaki style), simmered in miso, and as sanma-zushi pressed sushi.
Rich, oily, savoury fish with sweet fat-laden flesh, slight bitter organ note, smoky charcoal crust, bright sudachi acidity cutting the richness
Sanma must be cooked whole, not filleted, for shio-yaki — the internal organs are an integral part of the eating experience, providing a characteristic slight bitterness that contrasts with the sweet, fatty flesh. The fish is traditionally served with grated daikon, sudachi citrus, and soy sauce — the trio considered the mandatory accompaniment. Salt heavily (more than you think necessary) before grilling — visible salt crystals on the skin. Grill over direct high heat (bincho charcoal ideally) for the best skin crisping.
In Japan, the ritual eating of sanma involves squeezing sudachi over the whole fish, dipping each bite in daikon-enriched soy, and working systematically from the tail end toward the head — saving the crunchy, heavily salted tail fin as a final textural punctuation. The entrails are eaten with the first bites of flesh nearest the belly cavity. Look for sanma with clear eyes, bright silver-blue iridescence, and firm flesh — these indicate peak freshness. Sanma populations have declined due to climate change affecting migration patterns — check current stock sustainability.
Cleaning out the entrails before grilling — this is incorrect for sanma shio-yaki; the bitter organs are part of the flavour. Under-salting. Grilling over low heat, which steams rather than grills. Grilling without scoring the skin, which leads to curling and uneven cooking. Using bottled sudachi juice instead of fresh — the aromatic compounds in the freshly squeezed juice are incomparable.
Tsuji, Shizuo — Japanese Cooking: A Simple Art; Davidson, Alan — The Oxford Companion to Food