What can be a source of Scombroid Fish Poisoning?

Scombroid Fish Poisoning is primarily associated with the consumption of fish species that are high in histidine, particularly when they are not properly handled or stored. When these fish deteriorate, bacteria can convert histidine into histamine, which can cause allergic-like reactions upon consumption. Canned tuna is a well-known source of Scombroid Fish Poisoning because it is often processed from certain types of tuna that have high histidine levels. If the tuna is not kept at the proper temperatures during storage or processing, harmful levels of histamine can develop.

The other options, such as freshwater fish, shellfish, and frozen salmon, do not typically have the same high levels of histidine or are not associated with the same risk of histamine production when improperly handled. Therefore, canned tuna is the most relevant source of Scombroid Fish Poisoning among the choices provided. Proper handling and storage of fish are essential to avoiding this type of poisoning.