In restaurants, inform staff if you have a shellfish or fish allergy. Find out what your food is fried in and whether the oil has been used for anything else. Check the ingredients of all stocks and soups. Ideally your companions should avoid eating fish/shellfish in your presence, as there is a small risk that breathing in the cooked food may cause a reaction. People have also been known to go into anaphylactic shock after breathing in airborne particles of shellfish in open fish markets.
Fish and shellfish can be present in food in other formsDishes to look out for include paella, bouillabaisse, gumbo and fruits de mer (seafood). Oriental food tends to contain lots of different kinds of fish at once, and chopped pieces can be difficult to spot.
Anchovies may be found in caesar salad dressing, caponata, a traditional sweet and sour Sicilian relish, and Worcestershire sauce.