You know CM you can learn a lot from old timers. When working on a Chum issue I learned Harry had studied the history of them and it left me shell shocked. So lets take Chum and what is the North / South range now and historically. Well it moves folks North in warm periods ( earth time folks which is hundreds of years not human ) then South when things are warmer. ( think ice age ) It has been moving North for some time really since the last ice age but we had the blip when the Atlantic escalator stopped and wella little ice age, which is within historical memory, but North again now. This is known by archaeological research of aboriginal people who populated the West coast through time. What was amazing to me was how much the size of the Salmon population cycled up and down right down to lunar cycles effecting the ocean conditions and Salmon survival. We like to kill them in a very systematic way and that is direct conflict with nature.