Underwater Brook Trout Behavior while ice fishing using a Jaw Jacker, Len Thompson Spoon and Slender Spoon. To get this video I just pointed a GoPro down to watch what would go on while I had a Jaw Jacker set up and while jigging. This was a excellent day of brook trout fishing on very thin ice. The fish were coming in quickly and highly aggressive. You can see the difference in behavior between a dead stick presentation and jigging. It is very profound and might have you changing your fishing ways.