There are a few ways to tell when fish is cooked on the grill. One common method is to check the internal temperature of the fish using a meat thermometer. Fish is generally considered done when it reaches an internal temperature of 145°F (63°C). Another way is to observe the texture and color of the fish. Cooked fish will appear opaque and will easily flake with a fork. Additionally, you can use the "flake test" method by inserting a fork into the thickest part of the fish and twisting it slightly; if the fish flakes easily, it is likely done. Overcooking fish can make it dry, so it's better to slightly undercook it and let it rest for a few minutes off the grill, as it will continue to cook through residual heat. Remember that different types of fish may require different cooking times, so it's essential to adjust accordingly.

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Grilling Cooking Techniques Fish Cooking Doneness