Once the last shellfish is sold from a container of raw molluscan shellfish, how many days must the shellfish tag be kept on file?

The correct duration for keeping the shellfish tag on file is 90 days. This requirement is in place to ensure food safety and traceability in case there are any health concerns or foodborne illnesses associated with the consumed shellfish. By retaining the tag for 90 days, establishments can effectively track the source of the shellfish, confirming where they were harvested and allowing for potential investigations and recalls if needed.

The retention period is part of the guidelines established by the National Shellfish Sanitation Program (NSSP), which sets standards for the handling and serving of shellfish. This duration provides an adequate window to monitor any potential health issues that may arise after consumption, ensuring that food businesses can respond promptly to any reports of adverse events linked to their products.

Options that suggest shorter or longer retention periods, such as 30 days, 60 days, or 120 days, do not align with these established safety practices. Therefore, the specific 90-day requirement serves as a critical measure in maintaining food safety and public health.