Which type of shellfish must be sourced from safe sources?

Clams must be sourced from safe sources because they are filter feeders that can accumulate harmful substances and pathogens from their environment. If clams are harvested from contaminated waters, they can pose significant health risks to consumers. Ensuring that clams come from areas that are monitored for water quality and that are certified as safe for harvesting is critical in preventing foodborne illnesses.

While other options like crabs and sea urchins also need to be harvested from safe environments, the focus on clams is particularly emphasized due to their biology and the higher risk associated with exposure to waterborne contaminants. Grouper, being a fish, does not have the same feeding mechanism and contamination risk associated with shellfish. Thus, clams are recognized as needing stringent sourcing standards to ensure they are safe for consumption.