With Hiroshima oysters labeled “jumbo,” it is hard to tell from the product page alone how large the pieces actually are and how many minutes of heating it takes before they can be eaten. In this article, for the Jumbo Hiroshima Oysters 1kg (produce of Hiroshima Prefecture) from Echizen Kani Shokunin Kouragumi (DENSHOKU), sold by Denshoku Co., Ltd. (株式会社伝食) of Tsuruga, Fukui Prefecture, we’ve organized the publicly available product information and review-site listings into five points: contents, storage method, whether heating is required, suitability as a gift, and reviews. Its key features are 1kg of shucked 2L and 3L size oysters for cooking (850g after thawing), which reviews describe as individually frozen so you can use only what you need.
At a Glance
Key points
- 1kg (850g after thawing / about 26-35 pieces). Shucked 2L and 3L size oysters farmed in Hiroshima Bay, produce of Hiroshima Prefecture
- Arrives frozen; about 1 month in a home freezer. For cooking, not for raw consumption, and the page says they must be heated to a core temperature of 85°C for at least 1 minute
- Rakuten rating 4.64 (19,849 reviews). Viewed September 25, 2026
- Noshi (gift wrapping label) supported. You can add noshi when ordering
Watch out for
- They cannot be eaten raw. Thawing under running water is recommended, and the page says to cook them the same day after thawing
- Ingredient and allergen labeling is not stated on the product page. Oysters are shellfish
Suits: People who want to use oysters in cooked dishes such as fried oysters, hot pot, and rice cooked with seasonings, without the trouble of shucking
The amount, storage, heating, and noshi are from the Rakuten Ichiba product page (viewed September 25, 2026). The rating is from Rakuten customer reviews and does not necessarily reflect the current state of the product.
Compared with 6 Similar Oyster Products
Among the 6 oyster products featured on Ochinity (as of October 24, 2026). Each value is as of the date its own article was researched and may differ from the current listing. Ratings are Rakuten Ichiba’s display; values move more easily the fewer reviews there are, and they do not necessarily reflect the current condition of a product. The table is ordered by product name with this article first, and the order does not indicate superiority.
| Product | Total Amount (g) | Delivery Temperature | Rakuten Rating |
|---|---|---|---|
| Jumbo Hiroshima Oysters 1kg — Contents, Shelf Life & Reviews (this article) | 1000 | Frozen | 4.64 (19849 reviews, 2026-09-25) |
| Jumbo Hiroshima Oysters 2kg (For Cooking) — Contents, Shelf Life & Reviews | 2000 | Frozen | 4.68 (7230 reviews, 2026-10-05) |
| Hiroshima Steamed Oysters 850g — Contents, Shelf Life & Reviews | 1000 | Frozen | 4.77 (934 reviews, 2026-09-26) |
| Hiroshima Frozen Oysters 1kg (for Cooking) — Contents, Storage & Reviews | 1000 | Frozen | 4.83 (2883 reviews, 2026-10-07) |
| 松島牡蠣屋 Shell-On Oysters 2kg (Labeled for Raw Consumption, from Miyagi) — Contents, Shelf Life & Reviews | 2000 | Refrigerated | 4.49 (2846 reviews, 2026-10-21) |
| Oki Iwagaki Haruka Rock Oysters, About 2kg — Contents, Shelf Life & Reviews | 2000 | Not confirmed | 4.69 (631 reviews, 2026-09-25) |
Product names link to each product’s article.
- The total amount is 1,000g. Among the 6 oyster products featured on Ochinity (as of October 24, 2026), 3 products have 2,000g. If you want a larger amount, Jumbo Hiroshima Oysters 2kg (For Cooking) — Contents, Shelf Life & Reviews has 2,000g
- Rakuten’s rating is 4.64 (19,849 reviews). Hiroshima Frozen Oysters 1kg (for Cooking) — Contents, Storage & Reviews is 4.83 (2,883 reviews), and Jumbo Hiroshima Oysters 2kg (For Cooking) — Contents, Shelf Life & Reviews is 4.68 (7,230 reviews)
Basic Information
- Product Name
- Jumbo Hiroshima Oysters 1kg (850g after thawing / about 26-35 pieces)
- Amount
- 1kg (850g after thawing / about 26-35 pieces, 2L and 3L size)
- Country of Origin of Ingredients
- Produce of Hiroshima Prefecture (farmed in Hiroshima Bay)
- Storage
- Keep frozen (about 1 month in a home freezer)
- How to Eat
- For cooking, not for raw consumption. Heating to a core temperature of 85°C for at least 1 minute is required
- Thawing
- Thawing under running water is recommended. Thawing at room temperature or by heating is not recommended, and the page says to cook the same day after thawing
- Allergens
- Not confirmed (not stated on the product page. Oysters are shellfish)
- Price
- Not listed here because it changes
- Shipping
- Frozen delivery (guide for dispatch: within 2 to 3 business days)
- Noshi / Gift
- Noshi supported. The types of inscription, decorative box, gift wrapping, and message card are not stated
This list transcribes what is stated on the product page. However, the “not confirmed” labels and any notes we add are our own.
Oysters (kaki) are shellfish. Within what we could check, the product page does not show an ingredient list, additives, or allergen labeling. If you have an allergy, please contact the seller before purchasing, or be sure to check the label on the product once it arrives (reference: Consumer Affairs Agency, Japan, “About Allergen Labeling”, viewed September 25, 2026).
See the transcribed details, sources and “not confirmed” items (12 items)
This list transcribes what is stated on the product page. However, the “not confirmed” labels and any notes we add are our own.
- Product Name
- Jumbo Hiroshima Oysters 1kg (850g after thawing / about 26-35 pieces)Source: Rakuten Ichiba product page (viewed September 25, 2026)
- Amount
- 1kg (850g after thawing / about 26-35 pieces, 2L and 3L size)Source: product description on the product page
- Options
- Only 1kg in 2L and 3L size. There are no specification optionsSource: product description on the product page
- Part
- Shucked meat (no shell)Source: product description on the product page
- Storage Method
- Keep frozen (about 1 month in a home freezer)Source: product description on the product page
- Best-Before Date
- The “best-before date” field states about 1 month in a home freezer (no specific date is shown)Source: product description on the product page (viewed September 25, 2026)
- Country of Origin of Ingredients
- Produce of Hiroshima Prefecture (farmed in Hiroshima Bay)Source: product description on the product page
- Place of Processing
- Not confirmed (the item ships from a freezer warehouse in Tsuruga, Fukui Prefecture, the seller’s address, but the page does not state whether this is the same as the place of processing)
- State / How to Eat (Whether Heating Is Required)
- The seller’s product page states the product is for cooking and not for raw consumption, and explains that it needs to be heated to a core temperature of 85°C for at least 1 minuteSource: product description on the product page (viewed September 25, 2026)
- Thawing Method
- Thawing under running water is recommended. Thawing at room temperature or by heating is described as not recommended because it can affect quality, and the page advises cooking as soon as possible (the same day) after thawingSource: product description on the product page
- Delivery
- Frozen deliverySource: shipping information on the product page (guide for dispatch: within 2 to 3 business days; viewed September 25, 2026)
- Noshi / Gift
- Noshi supported. You can add noshi when ordering. The product page does not state the types of inscription (御中元, 御歳暮, 内祝い, etc.), decorative box, simple decorative box, gift wrapping, or message cardSource: Rakuten Ichiba product page (checked September 25, 2026)
- Manufacturer
- Not confirmed (the page shows only “Seller: 株式会社伝食 (Denshoku Co., Ltd.),” with no separate listing for a manufacturer or processor)Source: product description on the product page
- Shop
- Echizen Kani Shokunin Kouragumi (DENSHOKU) (越前かに職人甲羅組(DENSHOKU)) (Rakuten Ichiba)
Prices are not listed here because they change. Please check the current price and stock availability at the link above.
What Public Reviews Say
Below is a summary of the ratings and reviews published on Rakuten Ichiba. The rating figures reflect the time we viewed the page and will change afterward. The rating on Rakuten customer reviews is 4.64 / 5 (19,849 reviews, viewed September 25, 2026). We read 18 reviews in the default sort order. This sort order does not necessarily reflect the product’s current state.
What Reviewers Praise
Comments praising the size of the pieces, the plump texture, and the good flavor stand out. Reviewers also frequently mention the convenience of being able to use only what they need because the oysters are individually flash-frozen, and some say they are repeat buyers.
Source: Rakuten customer reviews (viewed September 25, 2026; summarized)
What Reviewers Note
A very small number of reviewers pointed out that the pieces were smaller than last time, that they noticed a slightly fishy smell right after thawing that went away after prepping, or that the texture felt a bit soft because the product is frozen.
Source: Rakuten customer reviews (viewed September 25, 2026; summarized)
Summary: Is This the One for You?
Why choose it: You want to prepare 1kg of frozen Hiroshima oysters for cooked dishes without the trouble of shucking. If that is your condition, this product with 1kg of shucked 2L and 3L size oysters fits (weak points: they cannot be eaten raw, and the total amount is 1,000g).
- They arrive frozen, with about 1 month in a home freezer as a guide. Heating to a core temperature of 85°C for at least 1 minute is described
- The Rakuten rating is 4.64 (19,849 reviews), and comments praising the size of the pieces and the texture stand out in the reviews
Other options: For a larger amount, see Jumbo Hiroshima Oysters 2kg (For Cooking) — Contents, Shelf Life & Reviews; for shell-on oysters for raw consumption, see 松島牡蠣屋 Shell-On Oysters 2kg (Labeled for Raw Consumption, from Miyagi) — Contents, Shelf Life & Reviews.
This section is based on the Rakuten Ichiba product page and Rakuten customer reviews (viewed September 25, 2026). The rating does not necessarily reflect the current state of the product.
Prices, stock, shipping fees, and delivery dates are subject to change. This article’s information-as-of date is September 25, 2026. Please be sure to check the listing at the link before purchasing.
This article contains affiliate links (advertising). Editorial Policy
This article organizes information published on various retail sites. Product details such as amount, storage method, and ingredients are subject to change, and this article reflects the content as of the information-as-of date.
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 25, 2026 / Sources: Rakuten Ichiba “Echizen Kani Shokunin Kouragumi (DENSHOKU)” (越前かに職人甲羅組) product page, Rakuten customer reviews, Consumer Affairs Agency “About Allergen Labeling” (Japan)
