I can start on that.
First of all, that 20 million is an aggregate number. When you think about the Fraser River, you see that there is a large number of runs, in fact, that will come back to tributaries. Aggregate-wise, you can come up with huge numbers, but it will vary system by system. As I was describing earlier, with the wild salmon policy and the identification of conservation units, there you get to a more detailed level of understanding of a particular run of fish, and we come up with goals for each of those runs. We call them “escapement goals”: how many fish do we want to go back and spawn?
We've gone through an exercise in the Fraser River of defining those escapement goals. Once you have those goals, you can do an evaluation of how close we are to meeting those goals, how far away we are, and where the risks are. You do the risk assessment with the data you have, and then you can come up with a way to monitor, track, and measure the progress or the viability of the returns of those particular fish. Then you have a better sense of how the various units are doing and, to go back to managing a fishery, you can take that into account when you allow fishing to occur at certain times and places. It is really those inputs that allow for the proper management of the fishery.