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Open a STEP / STP part and it measures itself — volume, thinnest wall, draft and undercut checks on load, plus hole detection with a BOM. Measure, section, export STL. Rust + WASM B-rep kernel, runs in your browser.
Skipjack fillets are simmered, deboned and smoked over hardwood again and again until rock hard, which gives arabushi. For karebushi, the fillets are scraped and covered with Aspergillus mould, sun-dried and brushed clean, about four times over six months. The moulds break down fat and draw out the last water. Made in 6 steps over 6.3 months. The longest step, grow mould, sun-dry and brush off, about four times, takes 6 months (Takenaka S) and runs at 27 °C (Takenaka S). Aspergillus chevalieri and Aspergillus pseudoglaucus, A. amstelodami, A. ruber and A. montevidensis do most of the fermenting.
Mould starter (Aspergillus glaucus group), sprayed at the start of moulding[buma2024]
Starter: defined mould spray or house mould (Aspergillus glaucus group)
Total time across the recorded steps: 6.3 months
Start
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What changes:The skipjack is headed, gutted and cut into four loins
Step 1 of 6
Head, gut and cut into loins
Time
Not documented
Temperature
Not documented
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Aspergillus
Output: four loin pieces per fish.
Flavour
Not documented
Texture
Not documented
Colour
Not documented
Microbes at work in this step
Not documented for this step.
Method
Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source
What makes this one different
Katsuobushi is cooked and smoked before it is fermented, and the ferment is a dry surface mould, not a brine. Arabushi stops after smoking; only karebushi and honkarebushi are moulded.
HonkarebushiMoulded several times; the highest grade.
Safety
Repeated smoking over wood leaves polycyclic aromatic hydrocarbons. Because Japanese data showed lower levels were not achievable with good smoking practice, the EU set katsuobushi limits of 5.0 μg/kg benzo(a)pyrene and 30.0 μg/kg for the sum of four PAHs. Low water activity (0.62 in karebushi) keeps it shelf-stable.
Dried bonito appears in the Taiho Code (701) and Engishiki (905). The modern method began in Kii Province in 1674, and Mori Yahei brought it to Makurazaki in 1707.