How long must Shellstock tags for shellfish be kept on file?

The correct answer indicates that shellstock tags for shellfish must be kept on file for a period of 90 days. This regulation is important for food safety and traceability. The tags contain critical information, such as the source of the shellfish and the date they were harvested, allowing health authorities to trace any potential outbreaks of foodborne illness back to their origins. Retaining these tags for 90 days ensures that there is sufficient time to identify and address any health issues that may arise after the consumption of the shellfish. This period aligns with FDA guidelines, which are established to protect public health by promoting proper handling and tracking of seafood products.