I hope to travel to Costa Rica in the coming months. I am allergic to many types of seafood: shellfish (shrimp, clams, oysters, crabs, etc), plus octopus and squid. However, I enjoy eating fish and order it often in restaurants. In the US I am able to tell a server at a restaurant "I am allergic to seafood" and cover all my bases, including possible cross-contamination during preparation.
At a restaurant in Costa Rica, is it sufficient to tell a server "Soy alérgico a los mariscos" in order to get this same message across? Or will I need to list out the individual food items (los camarones, el pulpo,...)?