Combine all ingredients in a small bowl with your fingers.
If using as a seasoning, just sprinkle on the fish before grilling.
If using as a true rub (which will season and start to cure the fish), sprinkle on the fish and rub with your fingers. Let sit for 2 hours up to a day in advance prior to grilling.
Recipe by Ultimate BBQ Sauce Recipes! at http://www.bbq-sauce-recipes.com/bbq-rub-recipes/top-10-dry-rubs/545/basic-fish-rub/