First, it outlines 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. Secondly, the chapter considers implications of changes in fish stock productivity and, finally, considers the consequences of changed stock migration or habitat location and what this means for stocks shared between two or more countries and those partly or wholly found on the high seas. However, global warming will add two complications.