And when will Country A realize that the stock will leave its EEZ for good and that its days with a major interest in the stock are numbered? It is possible to think of a “twilight” period in which Country B has not yet realized that it has acquired a permanent, major interest in the stock while Country A will realize that it has no long term interest in the stock any more. Country A may therefore decide that it serves no purpose to preserve the stock for future use and so neglect to leave any of it behind, while Country B has not yet realized that it would be in its interest to do so. No stock seems to have undergone such radical permanent shifts, but there are stocks which have experienced major shifts as a result of depletion or climate change and possibly a combination of both.