The countries involved might be affected differently, and so they would be if the habitat of a given fish stock is largely or wholly displaced from one country’s EEZ to another’s. This could upset existing agreements on sharing fish stocks. First, one should begin with what might be expected, drawing on the Fourth Assessment Report of the Inter-governmental Panel on Climate Change (IPCC), the Arctic Climate Impact Assessment (ACIA), and past experience. The reproduction of the stock from one year to the next depends on how much of the stock is left after fishing in both countries’ zones, the stock remaining in Country B’s zone after fishing returning to Country A’s zone.