Food · Fermented foods
Niji-masu (Rainbow Trout / Sea-Farmed)
にじます (Niji-masu)
Also known as: Niji-masu, Rainbow trout, Sea-farmed rainbow trout, Oncorhynchus mykiss, 虹鱒, Donaldson trout, サーモン (when farmed at sea)
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| Category | Food |
|---|---|
| Japanese labeling name | にじます 海面養殖 |
| Common Japanese notations | にじます, 虹鱒, ニジマス, サーモン (海面養殖) |
| Origin | Rainbow trout (Oncorhynchus mykiss); freshwater origin but with sea-farmed (海面養殖) variants now substantial; principal modern production Aomori, Iwate, Miyagi sea-pen aquaculture and Norwegian/Tasmanian imports; some sea-farmed varieties marketed as 'salmon' (サーモン) |
| Typical functions | Sushi/sashimi (sea-farmed niji-masu marketed as 'salmon'), Smoked salmon-trout retail, Foodservice fillet |
| Regulatory status in Japan | Standard food labeling. **Salmon is JAS-recommended-disclosure allergen.** Sea-farmed niji-masu marketed as 'salmon' should ideally clarify species in retail. |
Niji-masu (にじます / 虹鱒) — rainbow trout (Oncorhynchus mykiss), sea-pen-farmed — is increasingly marketed as 'sa-mon' (salmon) for sushi/sashimi applications. Aomori, Iwate, Miyagi sea-pen aquaculture and Norwegian/Tasmanian imports.
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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.
- Sea-farmed niji-masu fillet retail
- Smoked retail
Ingredient profile
Oncorhynchus mykiss rainbow trout, sea-pen farmed.
OEM applications
Sushi/sashimi.
Smoked retail.
For OEM: pre-prepared sushi/sashimi supply.
Regulatory classification in Japan
Standard food labeling. Salmon allergen recommended.
Regulatory classification in other markets
| EU | Established global rainbow trout trade. Salmon allergen mandatory. |
|---|---|
| USA | Established US rainbow trout aquaculture. Salmon allergen mandatory. |
| China | Major global trade. |
| Korea | Established trade. |
Market reference formulations
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Quick answers
- What is Niji-masu (Rainbow Trout / Sea-Farmed)?
- Niji-masu (にじます / 虹鱒) — rainbow trout (Oncorhynchus mykiss), sea-pen-farmed — is increasingly marketed as 'sa-mon' (salmon) for sushi/sashimi applications. Aomori, Iwate, Miyagi sea-pen aquaculture and Norwegian/Tasmanian imports.
- What is the regulatory status of Niji-masu (Rainbow Trout / Sea-Farmed) in Japan?
- Standard food labeling. **Salmon is JAS-recommended-disclosure allergen.** Sea-farmed niji-masu marketed as 'salmon' should ideally clarify species in retail.
- What products typically use Niji-masu (Rainbow Trout / Sea-Farmed)?
- Sea-farmed niji-masu fillet retail / Smoked retail
- Where does Niji-masu (Rainbow Trout / Sea-Farmed) come from?
- Rainbow trout (Oncorhynchus mykiss); freshwater origin but with sea-farmed (海面養殖) variants now substantial; principal modern production Aomori, Iwate, Miyagi sea-pen aquaculture and Norwegian/Tasmanian imports; some sea-farmed varieties marketed as 'salmon' (サーモン)
- What is the INCI / JSCI labeling name for Niji-masu (Rainbow Trout / Sea-Farmed)?
- JSCI: にじます 海面養殖
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References
- 文部科学省 (Ministry of Education, Culture, Sports, Science and Technology) Standard Tables of Food Composition — にじます 海面養殖
Last updated: 2026-04-28. Ingredient entries are reviewed at least annually against current regulatory listings.