Steamed oysters vary by product in whether cooking is required and how they should be thawed, which often makes it unclear whether a given item can be eaten as-is or how many servings it contains. This article organizes the publicly available product information and review-site descriptions for クニヒロ Marine Box’s Jumbo Steamed Oysters from Hiroshima into five points: quantity, storage method, ingredient labeling, suitability as a gift, and reviews.
What We Confirmed
- Quantity and available sizes
- Storage method and best-before date
- Ingredients and allergen labeling
- Whether it works as a gift
- Trends in public reviews
Basic Information
This table transcribes what is stated on the product page. However, the “not confirmed” labels and any notes we add are our own.
| Product Name | Hiroshima Jumbo Steamed Oysters, 850g, 1kg, Frozen, For Raw Consumption, Steamed Oysters, Shelled, Large Grain, No Cooking Required, For Home Use, For Commercial Use (Listed with the price-, track record-, and rating-related promotional wording removed from the Rakuten Ichiba product name) |
|---|---|
| Name | Frozen steamed oysters from Hiroshima Prefecture, farmedSource: as shown on the product page (viewed September 26, 2026) |
| Amount | 1kg (net: 850g)Source: same as above |
| What Changes by Selection | 2L / 3L (difference in oyster size. Quantity of 1kg / net 850g and price are the same for both). “2L” and “3L” are grade names assigned by the seller and do not indicate ranking or quality.Source: as shown on the product page (viewed September 26, 2026) |
| Storage Method | Keep frozen, store at −18°C or belowSource: product page description |
| Best-Before Date | The product page states that products are shipped with at least 30 days remaining until the best-before date (this is a guideline for the remaining period at the time of shipping, not a fixed number of days for the best-before date)Source: product page description |
| Raw Material Origin | Hiroshima PrefectureSource: product page description |
| Place of Processing | Not confirmed (the processor’s address [15-13 Higashi-Onomichi, Onomichi City, Hiroshima Prefecture] is listed, but this is not explicitly stated as the “place of processing”) |
| State / How to Eat (Whether Cooking Is Required) | The product page states that no cooking is required. Because the product has already been steamed at a core temperature of 85°C or higher for 90 seconds, it states that you can eat it as-is once thawedSource: product page description |
| Thawing Method | The product page describes rinsing the ice off the surface of the oysters under running water, then thawing them in the refrigerator. How long they keep after thawing is not confirmedSource: product page description |
| Shipping | The seller states that it is shipped frozen (Cool TA-Q-BIN, frozen). We could not confirm a description of the shipping method on the Rakuten Ichiba product pageSource: same shop’s product page on Yahoo! Shopping (food shipping condition and notes, viewed September 26, 2026) |
| Manufacturer | クニヒロ株式会社 (15-13 Higashi-Onomichi, Onomichi City, Hiroshima Prefecture) *Listed on the product page as “processor name”Source: product page description |
| Shop | クニヒロ Marine Box (Rakuten Ichiba) |
Prices are not listed here because they change. Please check the current price and stock availability at the link above.
Ingredients and Allergen Labeling
Within what we could check, we could not find individual listings for ingredient names, additives, or allergen labeling on the Rakuten Ichiba or Yahoo! Shopping product pages, or on the official website of the manufacturer, クニヒロ株式会社. This item is not confirmed.
This product is oysters themselves. If you have an oyster or shellfish allergy, you cannot eat this product. For any other ingredient or allergen labeling, please be sure to contact the shop before purchasing, or check the collective food labeling on the product when it arrives.
Reference: Consumer Affairs Agency, Japan, “About Allergen Labeling” (accessed September 26, 2026)
Five Things to Check Before Buying
| What to Check | For This Product | Basis |
|---|---|---|
| 1. Amount and Number of Servings | 1kg (net: 850g). Choose from two grades, 2L or 3L (quantity and price are the same; only the oyster size changes). A guideline for the number of servings is not confirmed | Product page description. No explicit statement of servings |
| 2. Storage Method and Shelf Life | Keep frozen, −18°C or below. The seller states that products are shipped with at least 30 days remaining until the best-before date (a guideline at the time of shipping, not a fixed number of days). How long it keeps after thawing is not confirmed | Product page description |
| 3. Ingredients and Allergen Labeling | Not confirmed (no listing on Rakuten, Yahoo!, or the official website). We recommend checking with the shop before purchasing | Checked the Rakuten Ichiba and Yahoo! Shopping product pages, and the manufacturer’s official website |
| 4. Suitable as a Gift | The product page explicitly states that noshi gift wrapping is not supported. Whether packaging or message cards are available is not confirmed | Rakuten Ichiba product page (gift options field) |
| 5. Review Trends | Rakuten Ichiba’s rating is 4.77 out of 5 (934 reviews). The name of the sort order, how many reviews were read, the span of posting dates, and how recent the latest review is are not confirmed, so this trend may not reflect the product’s current state. Many comments praise the convenience of eating it right after thawing and the large size of the oysters, while some note the short best-before date | Rakuten customer reviews (viewed September 26, 2026) |
Suitable as a Gift?
The Rakuten Ichiba product page explicitly states “noshi not supported.” We could not find a description on the product page of whether packaging (a gift box, a simple gift box, or gift wrapping) or message cards are supported, so this is not confirmed. If you are considering it as a gift, checking the following with the shop before purchasing can help avoid misunderstandings.
- Noshi is not supported (explicitly stated on the product page)
- Whether a gift box, gift wrapping, or message cards are available (not listed on the product page)
- Because it is shipped frozen, whether you can specify a delivery date and time the recipient can receive it
What Public Reviews Say
Below is a summary of the rating and review content published on Rakuten Ichiba. The rating figures are as of the time we accessed them and may change afterward. The number of reviews read is not confirmed, and this trend reflects the time of posting, so it does not necessarily represent the product’s current state.
| Site | Rating | Reviews | Viewed |
|---|---|---|---|
| Rakuten customer reviews (product page) | 4.77 / 5 | 934 | September 26, 2026 |
What Reviewers Praise
Many reviews mention the convenience of being able to eat it right after thawing, as well as its mild, non-fishy taste. Some also praise the large size and plump, springy texture, and how easy it is to use in a wide range of dishes such as hot pot, pasta, and butter-sautéed oysters.
Source: Rakuten customer reviews (checked by reading multiple reviews, viewed September 26, 2026)
What Reviewers Note
A few reviews point out the short best-before date and comment on the flavor.
Source: Rakuten customer reviews (checked by reading multiple reviews, viewed September 26, 2026)
Who It Suits / Who Should Be Careful
Who It Suits
- Want to eat it as-is after thawing (the product page states no cooking is required)
- Want to use it in a wide range of dishes such as hot pot, pasta, and butter-sautéed oysters
- Want oysters with a large grain size
- Have freezer space for 1kg
Who Should Be Careful
- Have an oyster or shellfish allergy (you cannot eat this product; other ingredient labeling is also not confirmed)
- Want to confirm a guideline for the number of servings in advance
- Want to use it as a gift with noshi or packaging (noshi is not supported)
- Want to confirm the remaining days until the best-before date in advance
Prices, stock, shipping fees, and delivery dates are subject to change. This article’s information-as-of date is September 26, 2026. Please be sure to check the listing at the link before purchasing.
This article contains affiliate links (advertising). Editorial Policy
Summary
- Because the product has already been steamed at a core temperature of 85°C or higher for 90 seconds, the product page states that you can eat it as-is once thawed
- Store at −18°C or below. The best-before date is a guideline of at least 30 days remaining at the time of shipping, and there is no listing of a fixed number of days
- We could not confirm ingredient and allergen labeling, or gift-related support other than noshi, on the product page. If you have an oyster or shellfish allergy, you cannot eat this product. If you are concerned about other allergies or plan to use it as a gift, please check with the shop before purchasing
Related Pages
This article organizes information published on various retail sites. Product details such as quantity, storage method, and ingredients are subject to change. Please check the seller’s listing for the latest information.
Comments on taste or quality are summarized from third-party posts cited with their source, and are not Ochinity’s own evaluation. Our approach to writing articles is described in our Editorial Policy.
Information as of: September 26, 2026 / Sources: Rakuten Ichiba “クニヒロ Marine Box” product page, same shop’s product page on Yahoo! Shopping, Rakuten customer reviews, Consumer Affairs Agency, Japan, “About Allergen Labeling”
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