Pickled fish is a traditional food that has been around for centuries. HERRING is a type of pickled fish that is commonly found in the North Atlantic and Mediterranean Sea. It is usually salted and then cured in vinegar or brine, giving it a unique flavor. EEL is another type of pickled fish that is usually smoked or cured in a mixture of salt and spices. Both HERRING and EEL are popular ingredients in many dishes around the world.