For trout I see them as unneeded. But for salmon and steelhead in bothe the rivers and the salt I like to use them. One real great place to have them is in swifter water where a 5 pound coho turns into a 15 pound coho with the help of the current.
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They say that the man that gets a Ph.D. is the smart one. But I think that the man that learns how to get paid to fish is the smarter one.