 will prevent sticking better than oiling the grill. If you oil the grill, then almost immediately the oil cracks and polymerizes and smokes and changes and it gives you less non-stick property. So oil the food. A thin layer of oil on the food. Most of it will drip off. That'll help prevent it from sticking. But that is the real problem with fish. And of course, it's a delicate tasting food. You don't want to give it too much seasoning. I think it likes herbs.