Every type of shellfish produces its own allergy-producing proteins.

An allergic reaction to shellfish usually occurs every time you eat the type of shellfish that causes the reaction.

Barnacles are a type of crustacean that attach themselves to whales.

Some people are allergic to only one type of shellfish but can eat others.

Some people are allergic to specific types of seafood, but can eat other varieties.

It is possible to be allergic to just one kind of shellfish, but can eat others without an issue.

Some people are allergic to only one type of shellfish, but can eat others.

A yabby, also known as a freshwater crayfish, is a type of crustacean that is found throughout Australia.