The appropriate weight depends on depth and trolling speed. Slow trolling for lake trout is different than moving fast for salmon. In my experience with trout, a 6 lb ball will suffice to about 60' but you will need 8lb for deeper trolling and some would argue for a 10 lb ball at 100' depth. For trolling at faster speeds, go to 10 or even 12 lb balls. With electric downriggers, ball size doesn't matter but cranking 10 and 12 lb balls all day on a manual downrigger can be a real workout.
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