United States
Hong KongShellstock tags: ninety days, and why they exist
Shellstock tags remain attached to the container until it is empty, are then marked with the date the last shellfish was served, and are kept for 90 days. They are the traceability record if an illness is later linked to a batch.
A small provision with an unusually specific number attached, which makes it a convenient exam question.
The rule
- Shellstock arrives with a tag identifying the harvester, the harvest location and the date.
- The tag stays attached to the container while any shellfish remain in it.
- When the container is empty, the date the last shellfish was served is written on the tag.
- The tag is kept for 90 days from that date, in chronological order.
Ninety days. Not thirty, not a year. It comes up as a straight recall question.
Why
Because shellfish are filter feeders. They concentrate whatever is in the water they grew in, which is why harvest waters are classified and monitored, and why an illness cluster traced to oysters needs to reach the specific bed.
The tag is the only link between a customer who became ill last week and a harvest area on a particular day. Without it the investigation stops at your door.
Shellstock from different containers is not mixed, because the tag then describes only part of what is in the bin. It is a common operational shortcut and it destroys the traceability the whole system rests on.
Receiving shellfish
- Tags present and legible, from a certified dealer.
- Live shellstock alive on arrival - shells closed, or closing when tapped.
- Received at 7°C (45°F), and cooled to 5°C (41°F) within 4 hours.
- Shucked shellfish in containers of the correct size, correctly labeled.
- Rejected outright where any of the above fails.
Dead shellstock is rejected, and shellstock that dies in storage is discarded. There is no cooking step that makes it acceptable.
Storage
Live shellstock is kept alive: at temperature, not submerged in fresh water, not sealed in an airtight container.
A display tank for live molluscan shellfish is one of the special processes needing a variance, which links this topic to the HACCP material.
The exam angle
Expect either the 90-day figure, or a scenario where a manager has discarded the tags on emptying the container. The second is the more interesting question and the answer is the same: the tag outlives the shellfish by three months.
Common questions
How long must shellstock tags be kept?
Ninety days from the date the last shellfish from that container was served. The tag stays attached while any shellfish remain, then the date is written on it and it is filed chronologically.
Why do shellfish need tags?
They are filter feeders that concentrate whatever is in their harvest waters. The tag is the only link between an illness reported later and a specific harvest area and date.
Can you combine shellfish from two containers?
No. The tag would then describe only part of the contents, which destroys the traceability the system depends on.
What temperature are live shellfish received at?
7°C (45°F), and cooled to 5°C (41°F) within four hours. They must also be alive on arrival, with shells closed or closing when tapped.
Can dead shellstock be cooked and served?
No. Dead shellstock is rejected at receiving, and any that dies in storage is discarded. No cooking step makes it acceptable.