I don't know whether I have enough time to explain it all. Right now we're really only seeing up to five-year-olds, if that, and there are very few of them in our population. The requirement is that the larger, healthier fish are producing larger and healthier eggs. We're missing those from the population as well.
As we've seen with other species, we try to pump more eggs into the system to increase stocks. We don't have the capability to do that with the mackerel stock, because the age structure is geared towards the smaller, younger fish that in some cases have not had an opportunity to reproduce yet.