Food · Fermented foods

Tsubu / Bai (Whelk)

つぶ (ばい) (Tsubu (Bai))

Also known as: Tsubu, Bai, Japanese whelk, Buccinum striatissimum, Babylonia japonica, 螺, ツブ, バイ

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At a glance

Category	Food
Japanese labeling name	つぶ (ばい)
Common Japanese notations	つぶ, ツブ, ばい, バイ, 螺, ヒメエゾボラ, エゾボラ
Origin	Whelks — multiple species commonly grouped as 'tsubu' or 'bai' in Japanese: Buccinum striatissimum (Hime-ezobora — premium Hokkaido tsubu), Babylonia japonica (Japanese whelk — bai); principal regions Hokkaido (volume), Aomori, Niigata, Iwate; CAUTION: salivary glands of some Buccinum species contain tetramine (tetramethylammonium) — neurotoxic — must be removed before consumption; sushi-channel and specialty foodservice
Typical functions	Sashimi / sushi nigiri (Hokkaido tsubu specialty), Tsuboyaki shell-grilled preparation, Nimono sweet-soy simmered, Foodservice Hokkaido-cuisine signature
Regulatory status in Japan	Standard food labeling. CRITICAL: Tetramine-bearing salivary glands of certain Buccinum tsubu species must be removed by trained processor before consumption — consumer-direct retail of unprocessed Buccinum poses neurotoxin risk. Mollusk JAS-recommended-disclosure allergen.

Tsubu / Bai (つぶ / ばい) — multiple whelk species: Hokkaido Buccinum striatissimum (hime-ezobora premium tsubu), Babylonia japonica (bai). **CAUTION: tetramine-bearing salivary glands of certain tsubu species must be removed by trained processor — neurotoxin risk.** Hokkaido, Aomori, Iwate regions.

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Classification

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Product applications

Functions

Flavoring486

Regulatory tags

Culinary ingredient512

Origin

Animal-derived87

Common OEM product categories

Finished-product categories where Japanese OEM manufacturers commonly formulate with this ingredient.

Live tsubu Hokkaido retail (sushi-grade)
Frozen tsubu B2B sushi-channel
Foodservice supply

Ingredient profile

Buccinum / Babylonia whelks (Buccinum may contain tetramine in salivary glands).

OEM applications

Sashimi / sushi nigiri Hokkaido specialty.

Tsuboyaki shell-grilled.

Sweet-soy nimono.

Foodservice Hokkaido signature.

For OEM: live sushi-grade retail, frozen B2B sushi, foodservice. **Trained processor required for tetramine removal.**

Regulatory classification in Japan

Standard food labeling.

**CRITICAL: tetramine-bearing salivary glands of Buccinum tsubu must be removed by trained processor.**

**Mollusk JAS-recommended-disclosure allergen.**

Regulatory classification in other markets

EU	Mollusks EU-mandatory allergen. Niche specialty. Tetramine safety required.
USA	Mollusk allergen disclosure. Niche specialty. Tetramine safety required.
China	Niche specialty.
Korea	Established as 골뱅이 (golbaengi) — domestic specialty.

Market reference formulations

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Alternative ingredients

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Sazae

Quick answers

What is Tsubu / Bai (Whelk)?: Tsubu / Bai (つぶ / ばい) — multiple whelk species: Hokkaido Buccinum striatissimum (hime-ezobora premium tsubu), Babylonia japonica (bai). **CAUTION: tetramine-bearing salivary glands of certain tsubu species must be removed by trained processor — neurotoxin risk.** Hokkaido, Aomori, Iwate regions.
What is the regulatory status of Tsubu / Bai (Whelk) in Japan?: Standard food labeling. **CRITICAL: Tetramine-bearing salivary glands of certain Buccinum tsubu species must be removed by trained processor before consumption — consumer-direct retail of unprocessed Buccinum poses neurotoxin risk.** **Mollusk JAS-recommended-disclosure allergen.**
What products typically use Tsubu / Bai (Whelk)?: Live tsubu Hokkaido retail (sushi-grade) / Frozen tsubu B2B sushi-channel / Foodservice supply
Where does Tsubu / Bai (Whelk) come from?: Whelks — multiple species commonly grouped as 'tsubu' or 'bai' in Japanese: **Buccinum striatissimum (Hime-ezobora — premium Hokkaido tsubu)**, **Babylonia japonica (Japanese whelk — bai)**; principal regions Hokkaido (volume), Aomori, Niigata, Iwate; **CAUTION: salivary glands of some Buccinum species contain tetramine (tetramethylammonium) — neurotoxic** — must be removed before consumption; sushi-channel and specialty foodservice
What is the INCI / JSCI labeling name for Tsubu / Bai (Whelk)?: JSCI: つぶ (ばい)

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References

文部科学省 (Ministry of Education, Culture, Sports, Science and Technology) Standard Tables of Food Composition — つぶ (ばい)

Last updated: 2026-04-28. Ingredient entries are reviewed at least annually against current regulatory listings.