I am not into the laws hole lot to be able to debate high water marks but they sound self explainitory.
However if a property owner can get 400$ from someone let them (I would never pay someone to fish I already pay the MAN a fee every year to fish now), but i do see one problem that we must all face and stand up to is liter that is why property owners get so mad ( I don't own property next to a river but even I get pissed when people leave stuff behind
)