I wonder if fish aren't coming north also due to the warming of the Arctic and the slowing of the Jet Stream? Along with our ocean currents, our other "big weather engine" is the Jet Stream -- which is powered by the opposing forces of cold Arctic air and warm air from the south. The Jet Stream is now slowing down and wobbling more because the pressure from the Arctic is waning -- I'd like to see more weather models including both of these forces -- I think it will explain some of the anomalies.