I was in Canada two weeks ago fishing mostly for northerns. I started out using a 12" 20Lb silver leader and I was catching fish, but my dad was catching 3 to every one of mine using the exact same lure.The only difference was Dad was using a 6" black 20LB leader.
I switched leaders (stole one out of Dad's tackle box
) and my catch rate definitely picked up.
Don't understand why, just sharing what happened. Next time I might try some 50LB mono or flouro & see what effect that has on bite rate.