You are assuming most systems start from stable equilibrium in the first place. This is what I was disagreeing with. Assuming of course it is really relevent to compare manmade fishing to natural cycles anyway.
I don't see what's wrong with regulating fishing according to wildlife models. They are the basis for instance for every wildlife conservation department in the country - you limit hunting, fishing etc. to replacement.
Well… you may have just assumed that yourself. I assume the aggregate fish population was relatively stable since the last ice age. Perhaps not, there may have been other catastrophes, but I'm not aware of them. So now in the industrial/information age the fish/predator equilibrium is going to have to adjust.
I really don’t care it people want to ban together to preserve species for sport or economics. I only have a problem when people think we're going to drive them all into extinction without drastic new action.