Food · Fermented foods
Muro-Aji (Brownstripe Mackerel Scad)
むろあじ (Muro-aji)
Also known as: Muro-aji, Brownstripe mackerel scad, Decapterus muroadsi, 鯥鯵, ムロアジ
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| Category | Food |
|---|---|
| Japanese labeling name | むろあじ |
| Common Japanese notations | むろあじ, 鯥鯵, ムロアジ |
| Origin | Brownstripe mackerel scad (Decapterus muroadsi); principal domestic regions Tokyo Izu Islands (Hachijojima, Mikurajima), Shizuoka, Kochi, Kagoshima; **defining ingredient for kusaya — Izu Islands fermented-brine dried fish** (one of Japan's most pungent traditional preserves); also defining ingredient for **kusaya-grade muro-aji-bushi dashi-stock** |
| Typical functions | Kusaya — Izu Islands fermented-brine dried fish (Hachijojima specialty), Muro-aji-bushi (dashi-stock dried bonito-style), Standard aji-no-hiraki preparation, Niboshi-grade dashi-stock production |
| Regulatory status in Japan | Standard food labeling. **Origin disclosure required.** Kusaya is regionally-rooted Izu Islands specialty preserve with strong distinctive flavor. **Fish JAS-recommended-disclosure allergen consideration.** |
Muro-aji (むろあじ / 鯥鯵) — brownstripe mackerel scad (Decapterus muroadsi) — is the defining fish for **kusaya**, the Izu Islands' iconic fermented-brine dried fish (Hachijojima, Mikurajima). Also produced as muro-aji-bushi premium dashi-stock.
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Classification
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Product applications
Functions
Regulatory tags
Origin
Common OEM product categories
Finished-product categories where Japanese OEM manufacturers commonly formulate with this ingredient.
- Kusaya retail (Izu Islands specialty)
- Muro-aji-bushi B2B dashi-stock
- Aji-no-hiraki retail
Ingredient profile
Decapterus muroadsi brownstripe mackerel scad.
OEM applications
Kusaya Izu Islands fermented-brine preserve (Hachijojima specialty).
Muro-aji-bushi premium dashi-stock B2B.
Standard aji-no-hiraki preparation.
Niboshi-grade dashi-stock.
For OEM: kusaya retail, muro-aji-bushi B2B, dashi-stock raw material.
Regulatory classification in Japan
Standard food labeling. Origin disclosure. **Fish JAS-recommended-disclosure allergen consideration.**
Regulatory classification in other markets
| EU | **Fish EU-mandatory allergen.** Niche kusaya specialty. |
|---|---|
| USA | Fish allergen disclosure. Niche kusaya specialty. |
| China | Niche specialty. |
| Korea | Niche specialty. |
Market reference formulations
Example finished products will be added after verification.
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Quick answers
- What is Muro-Aji (Brownstripe Mackerel Scad)?
- Muro-aji (むろあじ / 鯥鯵) — brownstripe mackerel scad (Decapterus muroadsi) — is the defining fish for **kusaya**, the Izu Islands' iconic fermented-brine dried fish (Hachijojima, Mikurajima). Also produced as muro-aji-bushi premium dashi-stock.
- What is the regulatory status of Muro-Aji (Brownstripe Mackerel Scad) in Japan?
- Standard food labeling. **Origin disclosure required.** Kusaya is regionally-rooted Izu Islands specialty preserve with strong distinctive flavor. **Fish JAS-recommended-disclosure allergen consideration.**
- What products typically use Muro-Aji (Brownstripe Mackerel Scad)?
- Kusaya retail (Izu Islands specialty) / Muro-aji-bushi B2B dashi-stock / Aji-no-hiraki retail
- Where does Muro-Aji (Brownstripe Mackerel Scad) come from?
- Brownstripe mackerel scad (Decapterus muroadsi); principal domestic regions Tokyo Izu Islands (Hachijojima, Mikurajima), Shizuoka, Kochi, Kagoshima; **defining ingredient for kusaya — Izu Islands fermented-brine dried fish** (one of Japan's most pungent traditional preserves); also defining ingredient for **kusaya-grade muro-aji-bushi dashi-stock**
- What is the INCI / JSCI labeling name for Muro-Aji (Brownstripe Mackerel Scad)?
- JSCI: むろあじ
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References
- 文部科学省 (Ministry of Education, Culture, Sports, Science and Technology) Standard Tables of Food Composition — むろあじ
Last updated: 2026-04-28. Ingredient entries are reviewed at least annually against current regulatory listings.