After Tom Nelson's presentation last night on downriggers and the effectiveness of black boxes I started thinking.... and had a couple of questions. Thought I'd ask them here as I don't want to have to wait until next week to ask Tom or the black box people.

1st question: (based on electrical current running down downrigger line)

Do black boxes only benefit downrigger trollers or is there a benefit if you mooch or bottom fish?

2nd question: (based on saltwater needed for galvanic action, i.e. generating electrical current)

Is there any advantage to using a black box in freshwater? Would this give an edge to people trolling for salmon, walleyes or pike?
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zen leecher