When must the date of the last sale or service of shellshock be recorded?

The date of the last sale or service of shellstock must be recorded on the shellstock tag or label because this is a critical aspect of seafood traceability regulations. The shellstock tag is essential in ensuring that all shellfish can be traced back to their source. This includes the harvesting date and the date of the last sale or service, which helps maintain the safety and quality of shellfish for consumers. Having this information recorded properly on the tag provides both regulatory compliance and necessary information for potential health investigations regarding shellfish-related illnesses. This practice ensures that any product can be easily traced back if there are concerns about safety or if a recall is necessary.