How can you tell when trout has finished cooking?

The fish may be checked for doneness by inserting a fork into the thickest part of the fillet at an angle and giving it a little twist. This is the most accurate method. When it is done, the fish will no longer have a transparent or raw aspect, and it will peel apart easily. To ensure that the fish is cooked thoroughly, it should reach an internal temperature of between 140 and 145 degrees.