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Salmon, tuna, and halibut are the fish most likely. to cause allergic reactions, but it is recommended. that individuals with any fish allergies avoid all fish. The term fish encompasses all species of finned fish, which can cause severe allergic reactions. The. protein from the fish flesh is most likely to cause an. allergic reaction, but fish gelatin and fish oil (which is. often less refined and may contain traces of fish.
Very few are actually allergic to iodine. One of the reasons people feel they may have an iodine allergy is if they are allergic to shellfish or simply fish. Both shellfish and other fishes are a rich source of iodine, but often those allergic are not responding to the iodine in the fish.