Japanese Ichthyology of Service: Fish Seasonality Calendar and the Professional Buyer's Year
Nationwide Japan, particularly Toyosu market and the seasonal Japanese seafood calendar
The Japanese seafood professional operates according to a detailed seasonal calendar that tracks the peak periods of individual species with a precision comparable to wine vintage charts. This shun-based seafood calendar (sakana no shun) is considered fundamental knowledge for any serious Japanese culinary professional. The calendar highlights: January—yellow tail buri (fat peak), Tokishirazu salmon; February—Hirame flounder, clams; March—wild cherry salmon (sakura masu), blood clam (akagai); April—amadai (tilefish), ainame (greenling), firefly squid (hotaru ika); May—katsuo (first catch, hatsu-gatsuo), young sardines (shirauo); June—hairtail fish (tachiuo), eel (unagi) pre-peak; July–August—unagi peak, hamo pike conger, ayu sweetfish; September—sanma arrival, katsuo second catch (modori-gatsuo, fat-loaded returning fish); October–November—buri approaching peak, hirame, Matsutake-paired fish; December—kan-buri peak, winter flounder, lobster ise-ebi peak. The distinction between hatsu-gatsuo (first katsuo of spring, lean) and modori-gatsuo (returning katsuo of autumn, fat) is a classic example of how the same species has completely different culinary value at different points in its annual cycle—the autumn fish commands 3–5× the price and requires different preparation.