The cooked trout will split into two parts with the bones sticking to one side. Flip the fish over so that the bones are facing up and then starting near the tail grab the spine and gently lift – you will be able to remove all the bones at once.
To debone a trout, first cook it completely, which loosens the connective tissues and makes it easier to debone. Then, use a knife to make a small cut at the base of the trout's tail, where the filet begins. Next, hold the flesh down while you pull the tail up and away from the trout to strip away the bones.
Cut through the skin at the spine (near the tail of the fish) to give yourself an access point Hold the tail and then use your knife to gently push the meat down. The cooked trout will split into two parts with the bones sticking to one side.
Remove the backbone and ribcage. Turn the trout back over, skin side down. Take hold of the backbone nearest the tail section and pull it up and away from the flesh to remove it. Pull slowly and gradually, taking care not to tear away flesh or break any bones. When done correctly, the ribcage should come away effortlessly with the backbone.