The Nevada County Sheriff may not know the laws regarding this (or don't want to go through the effort). I'd recommend the kid calling CalTip and getting in touch with a warden. They take these types of actions very seriously as Fish and Game code is pretty clear about this subject. If this behavior continues, I'm sure one of the non-profits (CalTrout, Trout Unlimited, American Whitewater) would love to take up a case against this individual. They are all firm defenders of public access rights.
“There is a cult of ignorance in the United States, and there has always been. The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that 'my ignorance is just as good as your knowledge.”
― Issac Asimov
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