LOL, Frank -- that's why I think you would be best off to mix up a blend to apply as a rub!
This is the recipe I use for blackening spice:
1 1/2 teaspoons salt
1 tablespoon freshly ground pepper
1 tablespoon cayenne pepper
1 tablespoon garlic powder
1 tablespoon onion powder
1 tablespoon thyme
1 tablespoon paprika
(as you can see, you can make whatever amount you want -- 1 of everything except 1/2 of salt). And with the Bhut powder, I'm pretty sure I would use considerably less than the cayenne called for here... Once you have the mixture made you just rub it on the fish (or chicken or whatever), then grill or pan fry.