Bring a large pot of lightly salted water to a boil. Add macaroni and cook for 8 to 10 minutes or until al dente; drain and cool under running water.
Mix both cans of tuna into the cooled pasta. Add the mayonnaise. Use more or less to your taste. You want just enough to get the flavor into the salad, but not enough to see the white of the mayonnaise on the noodles. Stir in salt, pepper, garlic powder, oregano and onion.
recipepes.commacaroni and tuna fish salad, Tuna Salad recipePT15MPT1H5455 calories