If you get a nice laker on or any large fish using braided line there is nothing slow about the rod tip bending.  Your drag will be singing and sometimes inexperienced anglers will think they have a rock.  Last spring I had a 30 seconds conversation with a novice about whether he had a fish or a rock.  After 30 seconds he agreed that he had a fish.  Unfortunately, he lost the fish so we never determined the size of the fish.  It is easy to tell.  If your canoe is moving and your drag is not singing you have a fish.  If any movement makes the drag sing you have a rock.