Which condition would cause you to reject a shipment of live oysters?

A shipment of live oysters should be rejected if most of the oyster shells are open because open shells indicate that the oysters are dead or not alive at the time of inspection. Live oysters should be tightly closed, or at least close when tapped, to show that they are still alive. When the shells are open, it suggests that the oysters may no longer be safe for consumption, which poses a significant food safety risk, as dead oysters can harbor bacteria that lead to foodborne illnesses.

The other conditions, such as closed shells, a mild seaweed scent, and the presence of shellstock identification tags, do not indicate a problem. Closed shells signify that the oysters are alive, a mild seaweed scent is typical and not a cause for alarm, and shellstock identification tags are essential for traceability and safety, indicating that they meet health standards.