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.
Classification
Tags below link to other ingredients sharing the same attribute, so you can pivot from one ingredient to its peers.
Product applications
Functions
Regulatory tags
Origin
Used in (typical product categories)
Finished-product categories that commonly include this ingredient in Japanese-market formulations.
- Kusaya retail (Izu Islands specialty)
- Muro-aji-bushi B2B dashi-stock
- Aji-no-hiraki retail
What it is
Decapterus muroadsi brownstripe mackerel scad.
Typical uses in Japanese products
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. |
Example products
Example finished products will be added after verification.
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Sharing similar functions
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From the same origin
Other ingredients that share an origin classification.
References
- MEXT 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.