To prevent fish from sticking on the grill, there are several techniques you can use. One effective method is to make sure your grill grates are clean and well-oiled before cooking. You can brush the grates with oil using a paper towel or a brush. Additionally, you can marinate the fish with oil or a marinade containing oil before grilling. Another tip is to preheat the grill to a medium-high heat and let it heat up for at least 10-15 minutes before placing the fish on it. When placing the fish on the grill, do it gently and avoid moving it around too much to prevent it from sticking. You can also use a fish basket or a piece of foil with some holes punched in it to grill the fish. Lastly, if you're grilling directly on the grates, you can use a spatula to carefully loosen the fish from the grill after a few minutes to prevent sticking.

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Topics covered in this question:

Fish Preparation Grilling Cooking Techniques Grill Maintenance