Give your caught and released fish the best chance for survival. Most fish taken out of the water are released back into the water only to swim away and float back to the surface till they die. Air fills their bladder and they can't release it unless lowered down where pressure will push the air out of the fish.
It only takes seconds to use. Push the needle through a soft spot on the Bottom lip of the fish, lower the fish down and one quick tug will remove the tool. The fish will swim away to be caught again. It's the latest and greatest tool for fish conservation ever made.